Having had 3 class C's, 4 class A's including a big heavy Allegro basement model, and having 3 Carriage 5th wheels 29'- 35' and a 36' 3 axle 18,000 GVWR - we can say from many years of experience that the crosswinds and 18 wheeler wind buffeting is a mere fraction of the rig moving or even being felt in the 5th wheels.
We are sitting in our 29' as I'm writing this 1250 miles from home. The ride is much better in the truck towing a 5th wheel or not towing and there's no rattles or jolts like in the A's and C's. Better fuel economy too. Setup for camping or leaving takes the same time or more with a MH towing a vehicle than with a 5th wheel and a tow vehicle. Overnighting, you just leave the rig connected.
Insurance and license registration cost is so much less with the 5th wheel and which state is your residency and registration makes a lot of difference. The 5th wheel in Michigan would have a one time fee of $75 to $250 registration fee for any pull behind trailer good for as long as you own it. Try that with a motorized RV and weep from both the insurance cost and yearly registration cost!
Also, motorized RV's depreciate at about double the rate of a 5th wheel and it's dual purpose tow vehicle for the same approx RV sizes.
Deb, with your 5th wheel you may have to walk about 5 or 10 more feet to use the potty because it always right behind you when traveling and you can pull off about anywhere or down an exit and back up the other side after using the potty.
I agree with Ed that your experience with ice north of Atlanta might not have turned out as well in your class C and I know we'd been off the Interstate and parked if we were in one of our class C's or A's like you probably noticed others had done also. They have lousy traction and the wind pushes them around constantly. God forbid if an 18 wheeler wizzes past you when you are on an icy patch! Looking back at the roadway where you also are supposed to be on is an awful sight to behold!