In my opinion, I would only focus on TIRES as they are a "wearable"/"deteriorating" item. I would allow the fitting of any tire that was within 1/2" of the Standard Dimensions for a tire using width by Radius measurements. In other words, a tire sized at 6.5" [the width of the tire]R16" [the rim size in inches] could be used on any 16" rim from 6" to 7" in width. It COULD be fitted to a 15.5" rim IF you used a rim strip to help seal the gaps. Making a rim strip using an adhesive and a piece of old rubber is a task AVE: Mechanics. Stretching that tire (using heat) to fit a 16.5" rim would be DIF: Mechanics AND add 1 to the tire's Wear Value (I keep track of suspensions since they wear out).
Rims:
For rims, it is easier to go up (to a bigger rim) than down. This will often require the manufacture of a "spacer" or "adapter" to fit the other rim. Bigger rims will have a bigger hole for the lug studs (the threaded "bolts" the lug nuts attach to) and the hub (in the center of the rim for the axle). The bigger a rim gets, the larger the hub and lugs get AND the more lugs you will encounter. Hummers have both 12 and 24 bolt lugs while a 5-ton using 53" Super Singles will have TEN (VERY LARGE) lugs that would be compatible with an Articulated Dump Truck (the offroad "rock trucks" that bend in the middle which are used by mines like the operations on Gold Rush). That LAV discussed in the first post would probably have had 28 Lugs of 1/2" diameter (it uses a 53" Super Single too) while a gen 1 Hummer usually had 12 1/2" lugs (the 24 lugs are for CTIS models) on a 20" rim, thus requiring some form of adaptor.
All of this doesn't even take into account going from a regular rim to a rim equipped with CTIS (central tire inflation system) which is different from normal rims on the same vehicle. This could get interesting quick depending on the vehicle... GOOGLE (as a reference) is your friend here.
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