Stuff in IL seems to go higher than the more remote bases. The remote bases sell more and have less buyers will to drive and get them. I bought my M101a3 private sale as it was closer than most bases and it is titled already so I didn't have to wait 3 months and deal with a trailer that might not be ready to roll home.
I don't think you can tandem in Illinois. You can here. I see trucks pulling campers and boats or trailer full of dirt bikes/quads. I've also seen double campers.