Friend of mine has a 6x8 trailer with two strapless stands in it, and he can squeeze two bikes in there or one bike and a large toolbox. It's small enough that he can back it into his garage and store it inside. Price is not as much of a concern really a couple feet doesn't really cost that much, so if you have space a 6x10 would be a little more functional. A single-axle 6x10 is light enough that you can move it around by hand with a helper when it's not on the hitch.