Hi Toni and welcome to the madness called myswag!!!
The only thing I know about them is that you don't set them up under the shade of a Coolabah tree.......
Other than that, check the general things like ease of set up / pack up, condition of canvas, strength of trailer construction, rust, type of suspension and any wear, condition of water tank and pump, lights working etc. Stand back a bit and see if everything looks straight and square.
Take your time and check it out one thing at a time, being methodical. Even write up a checklist and tick the items off as you check them or write down your observations so when you are talking dollars you are basing it on facts, not emotion.
Cheers, Avo
