Enclosed Trailer Questions

I have not been on here in a while...life got busy with kid stuff and I didn't race at all last year...Anyway, I'm planning on upgrading from my 18' open trailer to an enclosed trailer before racing season starts. I will be hauling my 67 Barracuda and some tools (that's about it)....Just asking for any advice/things to watch out for on a new trailer. I'm guessing 20' is probably a little short??.....with that said, I'm leaning towards a 24' with 5200 lbs axels. Any brands to stay away from?

Thanks in advance.