OP, it sounds like you have not used crates before. Instead of the hassle of getting a crate your dog "fits' in but doesnt like, try to make a trip to the nearest Petsmart, Petco or the like (they let you bring you dog in) and try a couple of crates in person. Bring treats. Pay special attention to the crate dimensions, how easy they are to break down and tie down.
Two of my dogs dont mind smaller crates (I call 'em travel crates opposed to the bigger at home crates) for short periods of time - it seems to make them feel secure. The other dog is never happy about anything
The smaller crates mean the dogs wont move around much in the event of a collision and they are very easy to strap down.
My 2c, hope it helps.