Good question. We were at Union Grove and besides lots of nice cars I noticed the trailer/tool/supply thing. The slower less exotic cars not so much, but the faster on the edge cars like Jays had a fairly common kit, basically three pounds of stuff in a two pound can. Several, plastic stackable flat tool boxes, couple small jack stands, small aluminum jack, battery impact, some had Honda 2000i generators, some the small 3 gal compressor, rolls off towels/handiwipes, personal travel bag, lots off soft nylon storage bags, 12v compressor, small spare parts, after these guys park and unload, get the cars ready, it looks like several garages exploded in the pits. Just a basic observation, some had more, some less. A few hours and several runs later, they pack up, jam everything in the trailer/car drive off, the pits are again empty. Very cool.