Will a 24' Class B+ on an E450 Chassis be too rough

I'm not sure how an E450 would help you anyway, sine you are flat towing (ie: no tongue weight). The biggest advantage is the extra GVWR, isn't it?

We have a 2014 Thor Chateau 31A on the F-450 chassis and the ride is good. Before this coach we had an 08 F-450 pickup with a 5th wheel and it was one rough ride.

We weigh in a 13,980# fully loaded as we normally travel. We pull an 09 Honda CR-V.

I have a 28' e450 Jayco and the ride is very rough. The suspension is extremely tight in the rear. My motorhome weighs 12000lbs fully loaded. We are constantly tightening pipes and fixing shelves etc. because they get shaken loose. Jayco has the Hellwig helper springs on my MH and I wonder if that is the cause. They are easy to adjust. Is there any harm in adjusting them looser?

So in my opinion yes I think the e450 might be a little too rough for just 24'. But that could be the Hellwig helper springs causing it. I will be very interested to see what others say. I am new to all this.