Wheel turning radius I understand is not the issue. For those shells that are retr0fitted with the 365 tires, trying to turn the wheels while you are stationary IS the issue. The new shells have a Slave Cylinder added to the drag-link, I think that's where it's added, to help with static turning. We have a friend who has done it to his 2001 Marathon "H" no slide and is absolutely thrilled with the results. He needs only to run 110 psi now instead of 130. Make sure a good alignment is done, so you track down the road. Our friend had a problem with wandering after the retro, and it turned out the drive axle was off a bit.
Jim and Chris
2001 Featherlite Vogue XLV 2 slide with Rivets-current coach, 1999 shell
Previous 22 years,
We have owned every kind of Prevost shell but an H3-40