The chassis is the best part of this coach. Having P-30 Chevy's, W Series Workhorse, etc.. The M2 chassis with the rear air bags and 22.5" wheels is night and day above the gas pullers. Wind, big rigs, down hills, towing are no longer anxiety issues, still would like more power on the long uphill grades but that's due to the amount of weight I seem to be constantly towing. Going from the Class A to the Seneca has a few disadvantages such as:
Front seats and cockpit can't be used as additional seating while camping (miss the swivel front seats)
Small front windshield, lower elevation - No view out the front while camping
Minimal driver / passenger storage - The Class A had pull out drawers, glove box, center console, M2 is very limited. Working on some solutions to add storage
Dash heater and AC cool driver and passenger quickly (small cockpit)
Driver and passenger doors
A real frame and engine in front of you God forbid an accident
Easy access to engine
An attention getter - Lots of people ask about the rig at stops
Good mileage - While towing 8,000lbs I averaged 10.5MPG @ 65MPH. My last gas Class A averaged 6.5.
The ride - Confident inspiring, the combination of rear air bags and 22.5 wheels help smooth out the road. and make for a stable ride I did weigh the coach and lowered tire air pressure to 85psi from the 110psi they were at which; made things even better.
No sway - I have towed a 3,300lb car, 6,000lb boat and 8,000lb trailer with no issues what-so-ever.
You will like the chassis.