The 1976 Jay Wren TT looks to be a single axle weighing around 2050lbs. With that said, once you put equipment and belongings inside and pack for an outing expect your weight to go up. Your Xterra should have no problem towing this. You would probably be ok to have a Class II receiver installed on your TV, since Class II's are rated up to 3500lbs. Assuming your tongue weight is under 300lbs. The trailer should already have a coupler size for a 2 inch ball, since a 1 7/8 inch ball is only rated to 2000lbs. If not, I would recommend changing that and going with a 2 inch ball rated from 3,500 to 8000lbs.
plug ins. the owner tells you its a 4 prong, which is possible. If that suits the needs of the trailer then go with that. With that said, I would recommend having a harness installed on your TV for a 4 prong flat, which is very common among the small trailers your Xterra is likely to tow, and if the trailer has the old 4 prong round, use and adapter or make a pigtail to bridge the gap.
This is the easy and quick advice which will get you up and running without much fuss. However, if you really want to cover your bases and can spend the money, then go with a good class III hitch receiver, a 2 inch ball and coupler, an the standard 7 prong harness and plug in, then utilize an adapter from the trailer to the 7 prong receiver. This will give you maximum versatility for future changes and expansions.
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