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Sounds interesting. If you plan on pulling a big trailer, you might also want to look at the NTC-400 and Allison tranny I have listed in the classifieds!
Here is a good rule of thumb (usually accurate within an inch or so)
9.00x20: 9" sidewall (bottom) + 20" rim + 9" sidewall (top) = 38"
11.00x20: 11" + 20" + 11" = 42"
14.00x20: 14" + 20" + 14" = 48"
Here are the wheels I have available for sale. I am trying to keep them in stock at all times. They are new HEMTT 2-piece wheels with the original 10 lug pattern milled out and a new 6 lug plate welded in. Orings and nuts included. Your choice of finish (unpainted, primed, painted, powdercoated...
I maintain a consistent 60 mph in my M818 with 395/85R20 tires. 14R20 tires should yield a few mph faster (at least on the flats and downhill runs). With 16R20 tires you could hit 70mph.
Even 14R20s can be too much tire for M809 series trucks. I highly recommend you take a look at 395/85R20 or 15.50/80R20 tires. 16R20 is a lot of tire for M818.
You can certainly use my dolly here in OKC to get your trailer, but no way I am going to let you pull it and M373 with your 3/4 ton truck! That is crazy. You can use my M818 tractor if necessary or maybe M813A1 will haul it to you with a commercial rig (rental).
XL and XZL tires should be same width at the sidewall, but the XZL tires certainly look wider with the more blockly looking 4 lugs.
Some of the military trucks that use the 16R20 are also authorized for 24R21 wide based tires.