Tim, 14's should be fine if the tire is lower profile which I am sure they are. My tires are fairly high profile as was the norm when then these trailers were built.
Thanks, Booker. The tires
I'm taking off are P205/75R14 Goodyear Conquests. I'll take some photos of the trailer on the new rubber this weekend and upload them next week.
I do note in your photo above, however, that you've got quite a bit more clearance around the tire than I do. Could be from the different tire, could be from axle
sag... who knows. I'm keen to drag my Trillium
over forest access roads, though, so the bigger and tougher the tire, the better.