May I suggest you look closely at the frame and consider strengthening it where appropriate? Also, make sure the material used in the frame is sufficiently strong to stand up to your intended use. I drug a similar trailer from Fairbanks to Tacoma in 1979 when there was still about 400 miles of gravel on the Alaska Highway. At the east end of Kluane Lake, I noticed the trailer was tilted. Upon inspection, the cross frame member to which the front spring shackles were welded had torn loose from the side frame members, allowing the axle to move to the rear about 4 inches, in turn letting the right tire scrape on the wheel well and lose its air. I was able to get it into Haines Junction and $1,000 of welding later, got the frame sturdy enough to continue the trip. You may also want to upgrade the axle and springs at sometime depending on where you want to use the trailer. Hopefully, the data plate on the trailer has info on the axle and springs, but if not, the manufacturer's website should have that information.
It's a lot less expensive to beef up the frame in your driveway/garage/shop than it is halfway between the middle and the edge of nowhere.
Best wishes for a lot of happy times in that trailer. I sure enjoyed mine . . .