The guy who used to own Martin Weigolds car put air jacks in his Ultima GTR. I think these items are cool if you are happy to have the necessary compressors or air bottles to run the air jacks. Easy at home with a compressor in the garage but you need ancillary gear at track side or you have to resort to the old fashioned way with regular jacks.
There was the time when our club used to attend the De Tomaso track days at Goodwood. They stayed in the pits, we used the track, a mighty fine arrangment to me! Anyway one of their guys had a number of Panterra's, one being the ex Le Mans race car which he bought for display purposes as the race team had kept back the engine, box and wiring loom! Come lunchtime the De Tomaso club wanted to do a photo session on the track grid as our club does nowadays. This race car was rolled out to the pole position and the owner wanted to show off the brakes. Up came ths massive air bottle and it was duly plugged in. But it did not have enough air to get the car off the ground level. He removed his wheels with the car on the tilt. No disasters if that was where you were thinking as the jacks did hold, but boy he didn't look cool with the wonky car display and the flaff he had to do to get it back on its wheels. And the brakes weren't particularly special either.
Also you have got to be adding weight to the car with the extra steel bracing required to hold the jacks to the chassis plus the weight of air jacks and air lines in the car. A compromise decision is required. But then not many trolley jacks go under cars with 4 inch ground clearance.
Unless you are serious racers, you really have got to want these air jacks to go the extra mile IMHO.
Compare the costs of the air jacks to a secong hand 4 post lift for home use.
Malcolm