Utility Cycling - Several trailer questions -- clueless

I just got a free trailer that appears to be in pretty rough shape, but I intend to still use it for groceries (not for pulling humans around -- I wouldn't trust it enough).

I have some questions, as I've never used any kind of trailer before.

1. How does that hitch connect to the bike? I have a surly LHT for what it's worth. It looks like it clamps to one of the chain stays, but I didn't want to jump the gun.

2. Are the wheels serviceable? One end has simple cotter pins attaching the wheels to the trailer frame, but the other (outside) end just has a roundish cap that doesn't feel like it pries off.

3. What the heck is that little wheel and the separate bar? I am guessing that the little wheel may connect near the hitch, but I can't imagine its function....

Thanks for helping a clueless person :)

looks like you have one of those models that you can use like a stroller. that is what that separate bar and wheel is for. the wheels are serviceable. you just have to remove the cotter pin and you should be able to remove the rims from the trailer by just pulling.

I would guess that it would clamp to one of the left side chainstays. My Burley cargo trailer originally came with a chainstay clamp/hitch. I have changed to a axle mounted hitch. It works better with my X that way. The chainstay hitch wouldn't work with my X.

I have just bought my first trailer, very similar your the one pictured. I was surprised that it just clamped to the frame, but it seems ok.