gdetrailer hit it on the head.
You may very well have to upgrade your tow vehicle, to have that large area of caution.
There are some beautiful, lightly used private sector trailers. If I'm buying new, I buy at the lot, used = person to person as much as possible.
I don't want to have to deal with "RV Lot Surprise" when dealing with the RV industry. Shabbily dressed "used car lot vibe" and absolute no ethics!
There is a lot of sense buying used, if you're new to the lifestyle. If you're sure you want to buy new, make sure that it's a quality building and manufacturer.
Some of the lightweight towables are Lances (spendy but well worth it) Minnie Winnie, Nash (Arctic Fox) & other Northwoods Mfg, Coachman, Grand Design, Airstream (literally no storage)
There are not many well made RV's on the market today and yesterday. Heck, some of the rv's today are re-treads from 1998
Here is a video made at Lance, it demonstrates the quality and the build standards, and the materials used (or NOT used in other RV's and trailers for the most part)
Lance Factory TourWinnie Minnie
1706FBAnother small Lance - this is the maximum I'd feel sale towing with your rig. Probably would be safer, one step down.
A Lance 1685A lot can be said for YouTube. Go there and start looking at big class A's (you'll see many of the appliances are the exact same as a Coachman TT.) It's what you can't really see that matters. Just start on YouTube and looking at all different kinds of trailers, and paying attention to what they're telling you. It's important to have a good understanding of RV terms.
I've caught YouTube "dealership videos" lying on their videos about various stuff, from holding tank sizes to tow weight abilities to materials used. Even on videos factory tours, while the thing is being built, they're lying LOL