I haven't seen anyone mention Ultimate Dive Trucks. We rented one and it was awesome to dive from. Tank holders, plastic totes, a cooler, shower and commercial grade lockboxes. Comfortably fits 4 divers. They are more expensive, but worth it my book. Especially if you're splitting costs. I don't have any personal or business interest in the trucks. I simply have used one and thought it was great.
The only first class rental truck: shower, locking storage, upright tanks, cooler and more.
www.ultimatedivetrucks.com