Loading and balancing the trailer

I have a baseline tongue weight now of 375#'s with a stripped down Pod. No propane tank, no batteries, no water or waste water, no cushions... I do mean stripped.

I've mounted my batteries (dual 6v's) and placed the tank back on. I just added 156#'s to the tongue. So by using the formula Force x Length = Weight x length (X) I built a spreadsheet using F=(W x X)L to determine how much gear to offset the added weight.

Interesting, that way reduced the counter weight by 73#'s. I will continue as suggested. Thank you for correcting.

I feel going beyond what is reasonable for the trailer (in my mind 420#'s) tongue weight is just asking for a issue with the A frame. As I've mentioned, my dealer is looking into my bent A frame. How much is too much on that A frame? I've done the scales and the math to find I run at about 400#s on the hitch. I have a bent A frame.. 375#'s is close to 11% of the trailer axle rating. I have strived to stay close to 3200#'s on the axle. That puts me very close to 12.5% of the rating. That to me is a very safe spot. I find that being there, I really don't need WDH, which I'd also like not to run with. I will run with sway control though (relax all, I not going crazy here.. LOL). 

You want to set up "stations" (aka "moment arms"), or distances from the "datum", which is a fixed reference location. In this case you are using the axle location as the datum. Then when you change the weight loaded at each station the spreadsheet will do the multiplication and addition of all the moments, then divide the total by the station for the hitch to get the weight being added or subtracted there. If you make all the stations aft of the axle negative then the math will work out. 

You can also subtract from the baseline weight at each station by putting a "negative weight" at that station. The math works for that too. In my case my baseline hitch weight included 250 lbs of water in the fresh water tank at the beginning of a boon dock trip.  Worst case I assume all that water moves aft to the gray tank for the return trip. That alone changes my tongue weight by 3%, so I worked on load distribution to get my starting hitch weight at about 14% and ending hitch weight at about 11%.  That keeps everything within limits, but doesn't leave much room for any unanticipated load changes. 

Thus, my added weight to counter balance is 107#'s, distance hitch to axle being 156" and load area behind axle being 66"

107 x 156 / 66 = 253#'s of gear to counter balance the added 107#'s on the hitch I added.

The 107#'s added to hitch comes from 136#'s of battery X Battery to axle 123" / hitch to axle 156"

136 x 123 / 156 = 107

I will get this right sooner or later... With your help of course!