Coming from a
Newmar chassis to a class C E350/450 series ? I would rent one for a week and see how it goes. You might find the ride very different.
You might also find the GM chassis on the C to ride better.
The passenger will have more foot room and from what many owners have said, the GM handles a bit better without doing modifications and special alignments.
My Ford E450 2018 Forest River Sunseeker has been a great 'coach' as far as it holding up but that's a pre-covid class C .
I have no idea how they are coming off the assembly line post covid.
I did spend a lot on Ford upgrades to improve the handling. Shocks, HD sway bars, HD steering stabilizer, rear track bar, positive caster alignment and fiddling with tire pressure.
On a calm day all is fine. If it gets windy with crosswinds and bow waves from semi trucks bounce me around on interstates. That's why i suggest, rent one to get a better hands-on idea.