I'm starting to look into a trailer, but the hitch is something I'm trying to figure out. I'd like something which I can use on both of my bikes. One is a vintage Bianchi with campy quick-release. The other is a fixed gear roadie with no quick-release and no hollow axle.

I'd like to avoid bending/scratch/tweaking the frames on both. Neither are show-peices, but still.

Looking for a sleek trailer like a bob yak, something that is fairly slim... I'll be attempting to hold our normal 20mph pace lines... something that would be much easier without pulling a "sail"/dual tire kiddy trailer. The yak attaches with a skewer, right? Would I have to buy another axle for the fixed gear bike?
I've seen the kid trailers that bolt onto the rear drop-outs, but don't really like the idea of clamping down on the frame, or the width that they go to inorder to clear the tire while turning.

I'll buy if cheap enough, but build/modify if I have to.

There's a bob yak for sale fairly close to me, pickup only, and is going for $100 (might go up)... but I'd like to try it with the fixed gear also. Should I suck it up, and make the bianchi the dedicated trailer hauler, or can a yak hitch go on a bolt on rear wheel?

EDIT: Maybe the Nashbar trailer? Looks like it can be had for $70... not sure what shipping would be. Although it's weight capacity is only 45lbs. I don't plan on carrying much... mainly a wooden box full of air.... with a sub, amp and small radio attached