I want a trailer as well....so I can trailer the bike to sunny warm places during the winter.
But I'm always concerned with the loading and unloading of the bike onto these things. Unless you have a long ramp you can walk beside the bike and walk it up, and the trailer isn't too high up.
Your ramp can be 8ft long and tie onto the trailer easily, then your not pushing up a 45 degree angle. If you look for places to load / unload with a berm or ditch you can be near level for loading.
Dont forget if you have a light trailer to have it connected to the car and rear blocking isnt a bad idea, having the trailer wheelie when your loading sucks.