You can get inflatable car "jacks" that are used to lift a vehicle on soft or uneven ground. They are just inflatable bags.
The problem using airbags for this particular job is the likelyhood of them being blown around in the downwash. You'd either have to peg them down - OK on grass - or have half a dozen or more people to hang on to them, which would be far from ideal.
Tyres, particularly heavy RR size take a bit of moving, and once they are in position everyone except maybe one marshaller can get well clear.