ependydad wrote:
You can generally get a decent estimate for non-toy haulers by using a calculator. Figure out what the pin weight percentage is for the dry weights (dry hitch weight / dry weight). Add 3% for an increase (since you're adding heavy batteries to the front; for fewer batteries- you can usually plan for 1-3% increase). Estimate your loaded weight and multiple it against the calculated pin weight percentage (dry percent + 3%). That'll give you a reasonable estimate for what your wet/loaded pin weight will be.
I built an estimator/calculator for just that purpose:
http://towingplanner.com/Estimators/TonguePinWeightFromDry
That's an awesome calculator! Thank you for that!