For me, the ultimate RV would be a 40'+ diesel pusher with a Jeep as my toad. The upper class A vehicles are usually built like tanks and can easily handle a lot of weight, so the construction is done with heavier and better quality materials.
Most 5th wheel RVs make some or a lot of compromises to keep the weight down. Plus, you're then stuck at whatever destination driving around this monster 1-ton DRW truck.
Don't get me wrong - both are great RV rigs, I'm just partial to the big buses.
Now, the flip side is that a good Class A is the cost of a medium to large-sized house, but the biggest, baddest 5th wheel toy hauler probably barely touches $100k.
2008 Suburban 2500 3LT 3.73 4X4 "The Beast"
2013 Springdale 303BHS, 8620 lbs
2009 GMC Sierra 1500 Denali (backup TV, hot rod)
2016 Jeep JKU Sahara in Tank, 3.23 (hers)
2010 Jeep JKU Sahara in Mango Tango PC, 3.73 (his)