[javadog]

Well, I would probably do the following:

Change the hitch to one that allows the trailer to be leveled. Check to make sure you have enough ground clearance for humps and dips and what not.
Load it as you normally would and stick it on some corner balancing scales, to see what the weights look like on all four tires. You’ll probably have to bribe some import/race prep shop to borrow theirs for a few minutes.
Check the toe on all four wheels, using a straight edge or string on each side.
Find a level place and then check the camber on all four wheels, as best you can without an alignment rack. There are a lot of do it yourself tools for this that should get you in the ballpark.

If any of the tow or camber numbers are out of whack, investigate further to see if you have a FedEx or some other problem.