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They keep the tire bead sealed against the rim. Use plenty of tire lube and squeen them into a bean shape with a ratchet strap to make it easier to get in.
Jeepnasty did a great job. This is the thread I Recommend reading. "Bobbing my M931 Suggestions, Advice, Recommendations for a trailer bed installation??" Read it all the way through.
1/4 channel is way to lite. Like lochjosh said, you need to use at least 5/8 plate and check the torque numbers on the u-bolts, it is going to be at least 375+
Bobbing a truck is a bit of work unless you have lots of mechanical experience and fabrication experience. Sounds like you are doing your homework with is smart.
I bobbed the truck in the picture. The owner is Charlie. That truck was a M931A2 and that is the original frame lenght. I have the springs to do the job at my shop. Give me a call, I am always glad to help out.