Three AirCon on 50amp works fine along with other normal loads in an RV. We have two 13,000BTU rooftops for the cabin and a separate unit for the garage (obviously used less, with the ramp-door set-up as a deck).
We LOVE having the ramp/deck set-up. If a Toy Hauler is not set-up to have this option...it is well worth adding the cables and hardware...with or without fencing, it is great
There are new offerings from Heartland and GrandDesign (Momentum) that have side patio deck...wow, beautiful!
Vacuum bonded and Laminate walls are pretty much the same structure. The makers either use pressure or vacuum, or both to bond the layers of the structure together to form a laminate. The odd ball fiberglass wall covering is "hung wall". That forms voids between the frame rails under the exterior when the surface is glued to the frame with adhesives. The voids can, but might not get filled with insulation (worth checking). Either system is time tested and work well as long as caulking is maintained around all wall openings...avoid moisture intrusion at all costs
For us...auto levelers are now a MUST. We've lived in and loved our old Class C, and several Towables that did not have auto levelers. Auto level makes set-up and breakdown SO MUCH nicer than tire blocks and stabilizers.
We added an electric fireplace to our Class A toy hauler after seeing it in a 5er...we use it EVERY trip. The heater is wonderful to augment the furnace like to take the chill off an early morning (and to use a campground's juice v. our propane
). And, the "glow" of the embers is a very nice nightlight.
All 3 brands listed are good from our experience. Keystone owners we know are very happy with their RV's.