You can always buy a WD hitch after a trip or two if you feel the combo needs one.
Having pulled 14'-16' 10k enclosed trailers too and from changing job sites for hundreds of thousands of miles no way I would mess with a single axle trailer.
Our first enclosed trailers were single axle but myself and other drivers who pulled them didn't like them so I switched to tandem axle trailers. Cargo/enclosed trailers were used as our job site tool trailers.
Two axle/4 wheels braking.
Much longer service life from 4 tires vs 2 tires.
The tandem axle trailers required less hitch weight for a good ride.
Much less worries about load balance. We pulled these trailers with our 3/4 and one ton DRW trucks and I can tell you a 10k single axle enclosed trailer make for a kidney pounding ride if the trailer wasn't loaded just right. Tandem axle trailers cured that issue.
I would suggest a tandem axle trailer.