I have seen many pros show up with a bunch of totes, and lets not forget the trash bag full of wheels and tires from their sponsors. Kinwald showed up at SRS with a bunch of stuff and a custom made pit table complete with built in power strip and floresent lighting.

I can easily fill up a tote (charger and power supply, box of spare parts, box with various shock oils, wheels and tires, tools, light, soldering station, and a box with wires, shrink wrap, sevo tape, etc.), and depending on the track, i bring a pit table, chair, extension cords, easy up, etc. Not to mention my radio and cars.

Everyone is different, but all the guys that bring less are always asking to borrow something.