The oil you have is the old label SeaDoo Mineral oil. They are phasing it out, so you can change over to the XPS synthetic blend without any issues.
The "V" for your trailer can be bought at some of the larger auto-parts stores... or at a hunting store like Gander mountian... or, even K-mart has a small boat section. Wal-mart use to carry them, but all the stores around here are going though a remodel, and have killed the boat section.