Have you weighed your 180?

I wound up with a tongue weight of 14% outbound (FWT full, gray empty) and 11% inbound (gray tank full, FWT empty). I'm happy with that. Trailer weight is around 3650 and doesn't change much. I use a wdh which adds about 90 lbs to the trailer axle, putting it at about 3350 inbound.  I installed axle reinforcement and bumped up to 15 inch LRD tires and 2450 lb rated wheels. 

Finished my Spreadsheet for Wt and Bal.  I'll upload it if I can figure out how.  PM me and I'll e-mail you a copy.  This is messy, but you can see it.  

Weight and Balance – 2016 R-Pod 180
*Basic Weight		3122	Lbs		Tongue Wt	442	Lbs
Item		Weight		Moment Arm		Moment
# Basic Moment	=	442	*	13.4	=	5923	Ft-lbs
*Batt/Rack (47 lb)	=		*	10.3	=	0
*LP Tank (38 Lb)	=		*	10.7	=	0
*Water Htr (50 Lb)	=		*	8.7	=	0
Fresh Water (30g/250lb)	=		*	5.6	=	0
Gray Water (30g/250lb)	=		*	-1.9	=	0
Black Water (30g/250lb)	=	250	*	-5.5	=	-1375
Wardrobe	=		*	-4.5	=	0
Rt Storage Cabs (Ctr)	=		*	1.4	=	0
Fridge	=		*	3.3	=	0
Shower	=		*	-3.3	=	0
Rear Wall	=		*	-7.0	=	0
Center of Bed	=		*	7.6	=	0
?	=		*		=	0
Total Weight	=	3372		Total Moment	=	4548	Ft-lbs
Tongue Weight	=	Total Moment	/	13.4	=	339	Lbs
NB: All weight in pounds, all dimensions in feet.
* Included in Basic Weight & Moment
# Center of wheel 0.6 feet behind “axle”/Suspension mount

When I bought my hitch, I wasn't thinking I'd ever really pull max load, and I bought a Curt because I know they fit without fuss.  So, this Curt is rated at 3500 lbs trailer and 525 lbs hitch weight.  There is a higher rated one, now, but not 3 years ago.  That's makes my concerns trailer and tongue weight.  Not too much, not too little.  And not too close to the limits, not knowing Curt's F.S.  I created it in Calc/Excel so it might run on my phone. 

The exercise was good.  I discovered there is not much way to get out of balance with normal loads in normal places.  Even a 100 pound generator in the bathroom is fine, unless the black tank is full and then you put it beside the fridge and Bob's your Uncle!  Fifty pounds of food and 50 pounds of clothes, no worries; put them anywhere.      

Offgrid,

The sloping line at the lower left is due to the hitch weight being too low at the lower total weights unless  the CG is moved forward.  At 3100 pounds the hitch weight doesn't get to 9% until the CG is moved forward to 14 inches.  At 3300 pounds hitch weight is good at a CG of 13 inches and at a total load of 3500 and above all is good with a CG of 12 inches.

Doing this exercise underscores Colt's comment about normal loads in normal places and CG is good.  I was surprised but...shouldn't have been...that the CG limit range is only 10 inches.  My Kitfox CG limits were only a 4 inch range but still easy to stay within.  I'll put the 11% hitch weight lower limit on the graph and see what that looks like.

I must be missing something. 9% hitch weight should always occur when the cg is 9% of the distance between the wheel hubs and the hitch, regardless of the trailer weight, shouldn't it?  14.4/161=.09?