I bought a Kendon 2 place fold up trailer. To be quite honest my original priorities were based on it's foldability, first and formost.
What I have experienced after hauling a multitude of bikes around, is that it is less than ideal for loading large or heavy bikes without assistance.
Examples:
The narrow ramp that comes with the trailer attaches with a couple of wingnuts underneath the foldup rear section. It is so inconvenient to store it there, that I generally have to carry it in the back of the vehicle. The spare tire carrier is underneath the trailer, also, which would make it a pain to access if you really needed it.
I found that in their stock, non-adjustable position, the factory wheel chocks will scuff the paint on the bottom chin spoiler of an FJR, (oops, found out the hard way, unfortunately) and that you have to put some sort of sandbag or padding up the front of the wheel recess to keep the chock from doing damage to the paint when you tie it down. The factory ramp that comes with the unit is a very short piece made up of tubing and is tough to see when backing up a bike, let alone impossible, without a spotter/assistance. Heavy bikes can be problematic to release from the wheel chock without some serious straining.
Loading a bike on the right side is not too bad because you can set the kickstand down while you tie down the machine.
However......
Loading a second bike is very tough due to the fact that you cannot walk along beside the bike (forget about riding it up the ramp, chief) on the left side, and you have to walk over the left fender assembly, (tricky) and stay focused on hanging on to the bikes controls. Also, since there is no decking on the left side for the kickstand, you need someone ready with tiedowns in hand. The Kendon wheel chock will NOT, I repeat will NOT support a heavy bike on it's own. Again, it's crucial to have assistance and muscle to get the job done on tall or heavy machines. :erm:
My next trailer will be one designed for ease of loading, probably one of those split tip-up trailers with a hydraulic shock that lowers each half gently after you load the bike. Forget about compact storage unless you are towing lightweight dirt bikes.