So between removing the home style porcelain toilet, water heater and iron drain pipes, it appears that the street side of my 19ish foot trailer will be approximately 80 lbs lighter than it was originally. Most of this weight loss is occurring in the rear street side corner where the bathroom will now be much lighter. A 12 volt marine battery under the street dinette will shift much of the weight forward of where it used to be on this side - but as noted - still 80lbs lighter overall.
The curbside will probably be a few pounds lighter than from the factory... three gallons less water, plastic instead of aluminum water tank and whatever the weight difference is between a new fridge and the 60 year old one that came with it... The fridge is directly above the wheel well and the water tank is in the rear corner opposite the now much lighter bathroom.
I’ll have two propane tanks on the tongue as it did originally. I’ll be getting new leaf springs installed at the end of the rebuild. It’ a 3500lb single axle Holiday House. Any concerns about these weight changes creating a problem with towing?
Indecision may or may not be my problem - Jimmy Buffett
If I am understanding what you did correctly it should not effect towing as long as tongue weight doesn't exceed hitch capacity. It sounds like you have removed 80 pounds from behind the axle that will make a little more weight on the tongue but not enough to make a major difference. My guess would be maybe 40 to 50 pounds. But any time you modify a trailer you should weigh it to make certain of its total weight and its tongue weight so that you aren't exceeding tire rating or hitch weight then do the math, you should have 10% or more of the total weight loaded or empty on the hitch. Always remember that as liquid tanks drain or fill the balance changes