C20 wheel compatibility

[DaveC20]

Hey everybody, am I glad to find this board! I've enjoyed reading several of the threads and I know there's a lot of people here that will immediately know the answer to a question I have.

Here's some background. My family's had a 1968 2WD C20 since 1977. It's got a 292 CID motor and a 4 speed w/ bulldog. It's in really good shape except for some rust on the front of the hood. It's got heavy duty springs (maybe even more than a std. suspension?) I used to haul 5000 lbs of coal in it routinely before we got a better source of heat.

This truck has 8-lug wheels. (I guess that's standard for a 3/4 ton). I'm thinking the wheels on it are original equipment. The problem is that they are 2 piece rims with the thing that looks like a beadlock. Whenever I take it to have a tire repaired, the people at the tire store look at me like I'm driving around on war surplus from Eastern Europe. Some places have said they don't want anything to do with the two-piece rims because they have a habit of flying apart and killing and maiming people. The places that will work on it stick the wheels in a steel cage to inflate the tires. I've gotten to the point that even I sort of stand to the side and flinch when I put air in the tires.

Now here's where I'd really appreciate a little help. I've decided that I really need to replace these wheels and I'm looking at my alternatives. I've seen several sets of new "take-offs" from R/V dealers and such on eBay. Am I right in thinking that I can use an 8-lug GM wheel from a new truck on my '68 model? I'd hate to buy a set of wheels that I'd end up having to use as boat anchors or industrial strength paperweights.