I have had two rigs that were close to impervious to crosswinds and big trucks going by. The first was a F250 6.0 PSD pulling an Arctic Fox 22H w/Reese W/D & friction sway bar.
The second is my current class C, see sig. The stock Chevy 4500 chassis with 47k miles on it does not get antsy until the crosswind is over 30mph. Another plus is no V10 engine noise.
Outside storage gets good at around 26’ to 28’ and up of coach length depending on floorplan. My last class C & this one have about 100cuft of storage in the back. If you get a class C with an overhead bed. That can be used for inside storage also, I did. My current rig has an entertainment center over the cab. But there is a surprising amount of room behind the TV that swings up & out of the way. The tow vehicle can carry the bicycles.
As far as drivetrain religion goes. I think it is more experience than religion. Being a Ford guy I like the V10 if you can put up with the noise and dog house. I almost did not even look at my current rig because it is Chevy based. But it has the kitchen counter space I wanted. So I did a long test drive and bought it. Also my mechanic likes the engine. Oh, I have learned to buy use RV’s.
I top off the LP every spring. I do not travel when it is near freezing out. I only turn on the water heater in the morning for a shower and then turn it off. The water stays hot all day. I also use electric space heaters to supplement the furnace.
Decisions, decisions, decisions…. Hope the above helps with yours.