5th wheel with largest tanks

I was considering selling the motorhome, and going to a fifth wheel toy hauler for the large tanks as well. The other consideration it seems, is lots of fifth wheels don't have generators. This also would be a must for me. The toy hauler not only has a tank for the generator, it has a spare tank for toys that also can be used to refill the generator tank. Some of the toy haulers have 150 gallon water tanks. That is a considerable amount of water. Add in the extra fuel for more generator time, and you could boondock for a long time. As a bonus, you can bring your wheeler or motorcycle. Im sure they are not every ones cup of tea, but something to consider. If you get a large enough one, Im sure the living quarters would be decent size.