If you’ve got a flange towbar as opposed to a detachable towbar then a Maxxraxx folds away really well. I used to keep mine in my uni room.
The maxxraxx is for sale (pm me if interested) as I now have an aiston rack, which is relatively flat so can be tucked away quite well.
I was going to recommend MaxxRaxx as well, they fold down really small as it’s basically 2 tubes.
It’s also possible to get a swan neck towbar fitting for MaxxRaxx but it’s not compatible with Alko hitch locks, as I found to my cost when I got one fitted. 🙁
the lighting board is really easy to fit on the MaxxRaxx if you use their hanger that just clips on to the rack.