The biggest piece of gear/pain in the butt in triathlon is the bike, which not only costs a lot of money, but is the hardest to get to the race site (or even some of your training rides). Whether you take the wheels off and stuff it into the back of your car, or you have some kind of rack option, you are in for some lifting and possibly forcing.
I have a bike rack on my roof; many people favour trailer racks because they involve less awkward lifting, and I get that. I feel that I’m strong enough to lift my bikes (especially my racing bike which is light, my commuter/hybrid is harder), the roof rack gets re-purposed in the winter for skiing, and I like having easier access to my trunk - I drive a crossover/hatchback and I’m constantly having to pull stuff out or put stuff in.
At any rate, Mike from BikeRackShops.com sent me this InfoGraphic, and it may be of use to anyone looking for bike transportation solutions.
guide to buying the perfect car bike rack