If your boat is as you say primarily a trailer boat and only occasionally in salt water, I would not think you would need ablative paint. Take a look at Petit EasyPoxy. Most marine supply houses have it, I painted my bottom of my sailboat with it and kept it in the Muddy Mississippi for 8 weeks. When it came out, the grime just hosed off.
Nice paint and went on with a roller and tipped with a foam brush like cream. Self leveled. Really nice paint. Here are before and after pictures.
"Lord, keep your arm around my shoulders, and your hand over my mouth."