No experience with KZ brand RV's but they have a 21 footer with a ramp.

[Linked Image from kz-rv.com]

https://www.kz-rv.com/products/sportsmen-classic-travel-trailers/

They also have models with a large upswing hatch on the back. This Escape series says it have an available off road package.

https://www.kz-rv.com/products/escape-travel-trailers/

Super small 12 footer

http://www.xplorcampers.com/xth-toy-hauler-12-.html


EDIT: Article with a few different options for small toy haulers. Hope this helps!

https://www.rvingknowhow.com/small-toy-haulers/

Last edited by dSmith_45; 04/24/22. Reason: added info