I would really consider replacing the tires. We also have a 2014 21C and when we got the trailer had very low mile on it and even though the date code said they were old I did not change them because they looked new. Eventually was a bad idea, one tire the belt came off the tire and knocked several holes in the fiberglass and there are marks in wheel well not sure I could ever get out.
We got the Goodyear Endurance when it comes to the tires. Plus make sure they jack the trailer up the proper way to change the tires, do not jack up on the axle.
Changing gears we are trying to figure out the history of 1st Gen 21C, what are the last 3 digits of your VIN number? See if yours is older or newer then ours.
All the best, smooth travels.
Steve
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