I think I might be a bit worried about the frame and
axle. The Compact Jr. was built as a
light, relatively affordable little trailer, and only weighs about 1000 lbs. to begin with (unloaded). I've seen the frame on one (looked at one to buy and crawled underneath, plus there have been photos on the forum), and they don't look very "beefy." Also, the
axle is usually a spring type, and people have reported more sway and bounce with them than with torsion axles on similar sized trailers.
So, things I would want to check on before loading it with 850# or more, would be as follows:
1) Is the frame sound and does it seem like it would carry close to 2000#
2) Does the
axle have a rating?
3) What is the load rating of the
tires and what shape are they in (oops, sorry, I see they are new so forget the "shape" part)?
4) Does the coupler seem up to the task?
Another question that pops to mind is whether you might have removed the structural "bulkheads" that are between the kitchen/closets and the beds (in order to make it hold a motorcycle). That could affect the trailer as well.
Raya