I'm trying to decide on an enclosed trailer for use for both carrying my equipment and tools, plus for advertising. I'm thinking about a 6'x12' single axle, that has at least 72" inside height clearance. Any recommendations on manufacturers? I really like the Haulmark brand. Would you recommend going with a double axle instead? I don't think I'll ever need to carry enough to justify a double axle, but not 100% sure.