If the rims are removed often enough you won't have any problems putting them on and off. If the truck is stored inside you would likely never have a repeat of the problem. It's not a bad idea to pull everything apart every few years at least to check bearings and brakes.
I have a '51 International L190 wrecker. I have no idea when the wheels were last off it before I got it. It has dayton hubs, I got the outer wheels off and then the spacer ring off without too terribly much hassle, the inner wheels were locked on solid. I had to use a blunt chisel to shock the rust out from between the rim and the hub. If you're not familiar with dayton hubs/rims the rim fits loosly on the hub against a larger diameter tapered surface on the back side and all is clamped together from the outside to center it all. The point being the rim was rusted in place in a position it couldn't stay on if all was free. When I had to change rims a few years later all came apart easily like it should.
On our '46 trucks the rim is made to fit the rim closely as that is what centers the wheel....so rusting in place is made all the easier. With regular maintenance you can get your pit time down.
Make sure you put some grease or anti-seize on the hub when you put it all back together as well.
Tad
