Seriously, there's likely more propane in a can of hairspray than it takes to charge an a/c. Propane is so efficient that it only requires about 1/3 the charge compared to R12 or R22 while typically outperforming either. It is also miscible in all common refrigerant oils. It's high side pressure will run higher but can be brought down with a slight addition of Butane.

I'd still be a lot more worried about travelling at high velocities with 15+ gallons of gasoline on board.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff