Relocating LP tanks and tongue jack to clear lift

Maybe this will help-I did move the tank closer to the front of the A Frame and I also use a manual jack. My welder did the work.  He had to remove the tank base, grind the area smooth and then relocate and weld the tank base to the frame.

Another thing you might try-use a manual jack and it is hel in with 3 bolts.  the bolt patterns are the same.  You can rotate the jack so the handle is on the side rather than the front.  a friend did this so his pick up tailgate would clear.

I did this for a different purpose-I wanted to mount the spare on the front and still have room for my Ford Expedition liftgate to open. It clears by 1.5"

Vann

If you do find you are within your comfort zone relative to the TV specs a weight distribution hitch helps get things back in better balance. Unfortunately its my understanding that Subaru doesn't authorize use of wdh's. 

The second problem is that the manufacturer's max ratings are just that, the maximums, not really something you want to do on a regular basis. It depends on conditions. It might be fine to tow your boat 5 miles to the lake on a nice day a couple times a year, but not when taking a trip into the mountains, or driving through a windstorm, or on a busy freeway with trucks passing you at 75 mph, or on a rural highway where a kid on a bicycle might be just around the next curve. That's where personal judgement comes in, and if you don't have a lot of experience towing it can be hard to judge when you are exceeding safe limits for the conditions. 

I get that its expensive to change tow vehicles, but beware of "cognitive bias", its very easy to ignore information that doesn't support what you want to believe. That's where the internet can be bad, its easy to find someone who will say that what you would like to do is fine. That doesn't make it so. Let the data and good judgement lead where it leads, your family's live and those around you on the roads are at stake.