Moving fresh water tank to the rear

marininn wrote:
Move the weight to above the axles, but not behind the axles. That will take weight off the tongue without causing the dreaded sway.That is not necessairly true. Reducing TW WILL make it more likely to sway, that is an absolute. TW is your friend. One cannot have too much of it, other than practical considerations of the ability of the associated parts to support it.
Usually this foolhardy endeavour is attempted to make up for the shortcoming of ones TV... Doing so gets one close to the worst of both worlds. An inadequate TV that is more likely to sway. Moving it back any number of inches towards the axle, but not behind them will reduce tongue weight. Look at the open bed semi rigs on the road, they usually put the weight on the trailer axles without issue. Of course their axles are the back of the trailer.
I move my tanks around on all the trailers/RVs I have owned. Never to the back, but just move to customize my floor plan. It is a bit of work to redo all the water connections and pipes, then rebuild cabinets but nothing but busy work mostly.
You need to consider the filler tube, the outlet pipe to the pump, the pump location, the routing to where it was connected and to the boiler.
I dont comment outside your question, on your tV, so good luck.