I would think that price is a big factor. Also, for most people, I would think that Harbor Freight is more readily available. There are a few of us out there with RT's but, in the process of building, that white Red Trailer sign on the back eventually gets painted over.
I had a problem with my RT but it turned out to be my own dumb fault. So, I still think RTs are better made than HF. Also, HF has fold-ups too and, the last time I looked, RT had trailers that weren't fold-ups. Oh! If you look at the weight, that might be another consideration. I believe RT might be a tad heavier than HF but I suspect that's because they are also a tad better/beefier made.
I don't know what state you live in; but, a while back, the PA store moved to a new location. I was told that about the same time, the PA owner was in a life-threatening accident that kept him in the hospital for an extended period. I think they kept that quiet while it was going on because they didn't want it to hurt business. During that crisis, there were a couple complaints about service here on the forum; but, since then, things have gotten back to normal and I think all is fine again.
Here are a couple people that I believe have used Red Trailers:
Mikeschn :
Sam I Am:
