What kind of tire life are you seeing with your Burley trailers?
I have an Encore, one of the last of the old US-built design. Sort of a stripped-down D-lite. I've just worn the second set of tires down to the cords. I pull it fairly regularly, but I'm hardly a fanatical trailer user. I'm guessing I got less than 1000 miles from each set of tires.
This trailer is designed (?) so that the wheels have a bit of inward camber,
kinda like this: /--\. I'm guessing that's why they wear out so fast...?