The answer to your question depends on the style of wheel the truck is running. Would it be possible to post some fairly detailed pictures of the rims, where the tire bead meets the locking ring? There is a design of wheel that has a full circle bead ring with a couple of relieved areas that allow the bead ring to be pried off the wheel after the tire is deflated. Others have a 3 piece design with a bead locking ring holding a much heavier design of bead ring in place. A third design has a slot cut into the bead ring which is pried off a little at a time in a spiral fashion. If you can post some pics, someone should be able to give you more accurate advice. In my personal opinion, I would not be comfortable with working with the thin ring type with the relieved area- - - -the locking lips are tiny, and the wheel is subject to rust damage that makes a catastrophic bead ring separation a possibility. The side load force exerted against the bead ring area on a tire that size is somewhere in the neighborhood of 35 TONS!
Jerry
