We went through the same scenario when we had a class a. I'd be willing to bet the driver's seats were similar to yours. I could do 8-12 hours with a truck / fifth wheel like we have now, but after about 3 hours in the motorhome, my back was killing me. We sold it before any modifications, but there are plenty of seats to change to. We were actually considering putting a leather seat out of a E-150 van in there, which is similar in feel to the truck seat. The seat that came in ours would probably fit anybody from 100 lbs to 300 lbs. Very wide. Being that I'm not a big guy, it fealt like I was spreading my wings to put my elbows on the arm rests. Just not comfortable. The E-150 seats were very doable, and had we kept it we would've went that route more than likely. It's yours, so really nothing stopping you from changing them out. Only challenge can be the seat pedestals, and there are adapters out there for that depending on the seat. Or, you can always mount new pedestals provided you can bolt through sufficient sub structure like the factory seat is.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.