Really? Know a p38 is smaller but would have thought 3m from boot lid to front footwell or dash would have got it. I get 3m conduit from rear upper corner down to front passenger footwell.
Tools can take up a lot, my day to day is tester, small bag for every job tools, snips, drivers, volt tester etc then smaller tool
Box for common but not needed tools like lump hammer, 12inch level etc then drill and impact box and screw and fixings box then two more 18” cubed boxes for everyday parts, cable, sockets etc. if I’m doing a rewire I can easily fill car but all unloaded on day 1 and loaded back up when completing job so not too bad.
Problem round my way is vans are a major break in target, and no matter what locks are on it they just rip doors off, using a car doesn’t stand out the same.