If anyone is considering a bike trailer but wary of riding up a ramp, here is one option:
This one is a RAMPFREE brand. Not sure if they are still in business but I found one slightly used on Craig's List for the bargain price of $1250.
There is no ramp at all - you just winch the trailer bed down to the ground and ride the bike on the trailer. You then winch it back up. It is very balanced and can be easily moved by one person even with a bike loaded.
Also, the model I bought came with a CONDOR front wheel chock so I leave my bike on the trailer when in the garage as it is very easy to ride on and off. The benefit of this is that I save some floor space and the bike is off the side/center stand where I can do limited work on it (clean, change oil, etc.). I put some car wheel dollys under the wheels which allows me to move the loaded trailer around the garage with little effort. Even with the dollys, the trailer bed lowers to the floor and will not move when riding on/off the trailer.
The trailer is standard 4'x8' bed size but the usable inside measurement is actually about 45" X 90" (Just enough width for the my RT with Ilium crash bar and highway pegs with a few inches to spare).
Downside is that you have to unhook from the travel vehicle to load/unload but this should not be an issue unless the trailer is used on a frequent basis.
There are a few companies that make similar styles but this is one of the smaller ones - Baxley is one of the more popular ones but it is much longer, heavier and expensive.