A ratchet strap works pretty good to squish the tire enough to seat on the beads. I carry one in my 4x4 in case I break a bead while aired down. I have on board air with a small tank mounted under the rig.

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Brian
87 300Dturbo 180K #14 head still running R-12 SOLD 12/2017
02 F350 Powerstroke 180K
05 Chevy Express 1 ton w/Royal Utility box 120K
08 Infiniti FX-35 40K
15 Golf Sportwagen TDI 35K
10 Sprinter 3500 chassis with a Class A Winnebago on it. 56K