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Dengle View Drop Down
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Direct Link To This Post Topic: Bumper generator tray
    Posted: 11 Apr 2021 at 1:30pm
Offgrid: Agreed. Yea, son-in-law thought I needed an inverter generator, though I never even suggested or discussed - let alone gasoline vs. propane. I would have held back from purchase, but hard saying no to a gift horse. Both he and our son own pick-up trucks and both have taken the Rpod out (once each). The gasoline generator would be a no issue for them. Not many on Forum disclose pulling Rpods with SUVs of medium size, like your Highlander and my Grand Cherokee. Just didn't want something bigger for local transportation. Probably should have held out for V8, but sometimes the "urge" gets the best of you. Guess my post has expanded beyond the subject of tongue weight and generator trays. Got the answers though.
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Direct Link To This Post Posted: 11 Apr 2021 at 12:50pm
Dengle, you're right about the weight stuff.

I moved all my tools, tent, chairs, and ladder to the SUV to get the tongue weight down to 500. About the only things left in my storage area are the plastic levelling blocks, the jack crank, and the coax cable for my cell antenna. Nothing under the bed except a couple pair of hiking boots. The weight is in the water, batteries, propane, and 8 inch mattress.

Re the generator, if your Sherline tells you you're getting heavier than you want to be on the tongue, maybe sell the Westinghouse genny on CL and get a dual fuel or convertible one that won't stink up your SUV. It would be a shame to have to give up on boondocking or camping in undeveloped state and federal campgrounds. Just a thought.....
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Direct Link To This Post Posted: 11 Apr 2021 at 8:17am
Offgrid & Olddawsrule: Thanks for input. Ordered Sherline 1000 yesterday (prior to your post). Offgrid, you've discussed tow vehicle & trailer weight calculations so many times you'd be super rich at one cent each. I'll reconsider the generator idea and perhaps be more practical. Boondocking, unless necessary is no longer on my wife's bucket list, though avid tent campers previously. On the Rpod, I usually store the Rdome, telescoping ladder, folding chairs under the 179's forward bed. Tools etc. fill the cargo area at the tongue. Bikes would go in cargo area of SUV. Carried bikes once on trailer receiver (without incident), having to place spare trailer tire in SUV. Will no longer do this based upon knowledge learned on this Forum. I'll deal with my dilemma, make reasonable decisions and surely have good times. Again, my appreciation.
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Direct Link To This Post Posted: 11 Apr 2021 at 7:25am
'zactly
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Direct Link To This Post Posted: 11 Apr 2021 at 7:19am
This is the stress point OG refers to. I can attest to it being real!

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Direct Link To This Post Posted: 11 Apr 2021 at 7:15am
Dengle, before adding a generator and rack on the tongue you should get the tongue weight of what you have already. That should include full propane and water in the fresh water tank if you plan to carry that. With water in my fwt and water heater, a single full propane cylinder, and my (very heavy) dual batteries, I had to remove everything heavy from my storage compartment and shift other supplies rearward to get my tongue weight down to 500 lbs, which is my Hilanders max.

Your Grand Cherokee is probably rated for 620 lbs (most are set at 10% of max trailer weight) but check your manual.

Almost all the generator and rack weight is going to get added to the tongue weight so once you have your current tongue weight you can calculate about where you'd end up

Your wdh doesn't change any of your max vehicle ratings, but it needs to be able to the loads put on it, which includes both the trailer tongue and stuff it's lifting in the back of the Jeep, so I think 600 lbs is going to wind up being a bit too light for what you are considering. But wait and see what your tongue weight is.

There are a couple of ways to get your tongue weight. One is to buy a tongue scale, Sherline makes the one mist folks here use. Or you can go through a public scale, once with and once without the trailer, and subtract the Jeep total weight from the second weighing from the combined weight of the Jeeps two axles (trailer axle not on the scale) from the first run. Be sure your wdh is untensioned or it will throw off your measurements. Leave it on the Jeep for the second run, and put the bars in the back of the Jeep.

On other caution. While the weakest place on the trailer frame is just behind the axle, the second weakest is right about where the a frame attaches to the frame rails. It's not as close there so you have some headroom, but adding extra load at that point, whether batteries, water, generator, or yanking down on the frame with the wdh bars all add up and at some point that will become a problem area too. Basically rpods are lightly constructed trailers and there's no real good place to add heavy stuff to them without having issues.


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Direct Link To This Post Posted: 10 Apr 2021 at 7:12pm
[QUOTE=StephenH] Stromberg-Carlsen Trailer Tray is a good option for the smaller generators...

StephenH: Trailer Tray is remaining option. Its weight is 63 pounds. With generator and one gallon gas can, we're looking at 125 approx. My Fastway 92-00-0600 e2 Trunnion Hitch rated at 600 pounds would allow if trailer loaded properly. Offgrid (I think) once posted the liking of about 500 pounds tongue weight on his Highlander tow vehicle. With a single battery and 20 pound size propane tank, perhaps this is feasible. Thanks.
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Direct Link To This Post Posted: 10 Apr 2021 at 4:55pm
Stromberg-Carlsen Trailer Tray is a good option for the smaller generators. Not so for the larger ones. They are too big and heavy to lift up to there.
StephenH
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Direct Link To This Post Posted: 10 Apr 2021 at 8:05am
Originally posted by Colonel Podder

Thanks for the opinions and comments, not sure what I will do, just researching and thinking through things.
Looks like the 196 has a 5" C channel frame that runs the the entire length. It could be a box frame, not sure since the bottom is enclosed, but I would doubt that FR would use box tubing. With the rear kitchen and pantry area, maybe the frame is a little more robust in that area? I know these models did not exist more than a couple years ago, so maybe there have been some changes over time.
I do have a welder and have the ability to do some welding, but would rather not, at my age these things are harder to do. 
Thanks again!


The mid sized rpods use a 4x2X0.1 inch box tube. Box tubes are a very strong shape which lets FR get away with using such a thin wall. But it's really quite marginal, and attaching a torsion axle to it doesn't help. A leaf spring axle would put much less bending stress on it.

The important figure of merit for calculating beam stress is the section modulus which is 1.22 in^3 for the 4x2 box tube. Bigger is better and it's linear, meaning that if you double the section modulus the stress is cut in half. If you wanted to compare that to the 5 inch C channel you would need to know the flange depth and thickness. Then you could use this calculator:

https://amesweb.info/section/c-channel-section-properties-calculator.aspx

Of course the 196 is a bigger heavier trailer which needs a stronger shape just to carry it's load, so you wouldn't get to take all of any additional frame capacity to support stuff hanging off the rear.

What I would do to reinforce the frame at the axle attachment on my 179 is to remove the 3.5 inch riser and weld on about 3 ft sections of the same 4x2 tube under the existing tube. That way I'd end up at about the same height but with a much stronger frame (about 4x stronger actually) at that weakest spot. The stresses drop off quickly to the front and rear of the axle attachment so there's no need to run the reinforcement very far.
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Direct Link To This Post Posted: 10 Apr 2021 at 7:57am
offgrid: Thanks for reply. Yes, I know a cookie sheet. I now recall you converting your generator to propane. Forgot about that post. I cannot do with my Westinghouse iGen2600 received as gift. Re my gasoline question: I thought about a one gallon, quality metal can mounted next to the single battery on the tongue. Strapped securely, I don't see a problem. I'm in a dilemma where to put the generator. Not on the rear bumper for sure. Comments?
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