^^^ These would be my recommendations. Grease and max tire inflation are obvious.
Add a set of cheap ratchet straps, and Boat US.
Why?
Last year, while towing long distance over a long weekend I got two tires slashed by an object on the same side of the trailer. I managed to control the trailer but ended up stuck on the side on the road in a precarious position - the trailer was so slumped to the side I was worried it would roll - and the coupler was stuck at an angle - wouldn't come off of the trailer hitch, lol, a f@cking nightmare. It was dark, 2am, was with one of my young children, and two dogs.
The AAA couldn't help me because they don't deal with boat trailers. The Boat US saved the day, they send a local guy who took forever to get to me, but was able to use his platform bed to lift the trailer side up enough to manage changing the one spare I had, and then we compressed and strapped up the other spring, so I could drive off to safety (at 15mph in a breakdown lane).
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