Originally Posted by
thumpism
Disassembly of the bike to fit inside is a possiblity but is that a hassle you even want to consider? I'd buy a cheap rack off CL and give it away or toss it at the end of the trip.
I've used the cheap trunk rack on occasion with both rental cars and with my own. One thing to watch for is that the load is spread over a large and strong enough area of the trunk so you don't get indentations in the trunk lid. I don't worry about it if it's my car (keep them long enough that minor cosmetic issues no longer affect resale value), but it could lead to liability issues with a rental car.