I have two enclosed trailers. Both have FULL large toolboxes, equipped as close to my large chest at home. I travel to race and nothing worse than not having a needed item 500 miles from home. Same for the heads up car, we have spare everything and tools to replace everything. Cant be 2000 miles from home at Norwalk and not be able to get something repaired because we didn't bring the tool. If you just run local bracket track a few miles away, then IMO just small socket set, some screwdrivers and wrenches should be enough. Anything major just take it home.