Why would you buy a new one? I mean, those are reliable enough and if you getting a used one, I am pretty sure that it will be in a good condition anyway. Maybe there will be some cosmetic damage but anyway.
So, here is a useful link if you are in search of auto haulers for sale. Those are top-notch ones so I don't know if you want something like this or you are aiming for simpler models. But I'd say that getting a better one definitely is a worthy idea.