Texas Parks and Wildlife only deals in boats and outboards, not trailers. Make out a generic bill of sale and have the previous owner sign it segregating the boat, motor, and trailer. A formal form is not necessary in what youre looking for. I think LA. DMV is wanting to know what to tax you against. Have you ever made out one for yourself? On November 1, 2007 I sold the following to selm 1. Boat – $10,000 Motor – $5000 Trailer – $500 John Doe