So next weekend I might be heading out to get some racecar pictures, but I don't have a telephoto lens. I've got a 5D mkII with 24-105L right now. I'm hoping to rent a Canon 70-200 2.8L IS. Unfortunately there aren't any camera shops that rent within about 200 miles in the opposite direction of where I'm heading that I could physically pick one up (the nearest would most likely be in Vegas). So now on to my question of legit places online you can rent them. I've already googled it, but I'm a little leery of some places. I want to make sure I don't get ripped off. What have you used with good success? Also, would the 70-200 have a long enough reach, or should I go with the 100-400 at the sacrifice of a tighter aperture? It's on an outdoor 3/8 mile dirt track, and I'll have access to the infield so I shouldn't be TOO far away.