This is actually fairly common, and it's actually standard to rent the vehicles. When I was a contractor for MAC tools, they would rent cars for the week from

This is actually fairly common, and it's actually standard to rent the vehicles. When I was a contractor for MAC tools, they would rent cars for the week from the local Hertz branch, documenting the tear down for one of their products, and then disassemble, and then reassemble them during that work week, returning the rental vehicle on Friday. Hertz didn't seem to mind -- I asked the Hertz manager the next time I was renting a car from there why they did it, and he openly told me that he could charge them 6 times the normal weekly rate (which looked good for his numbers), he would drive any vehicle returned for the next week to make sure there weren't any issues, and that the dealership would still warranty any damages, so, he saw it as a win/win... ...I'm not so certain that I'd take a risk like that, though.