I am thinking about getting an enclosed trailer. I was wondering how strong the walls are. On my open trailer, my walk-behinds get bumped up against the sides and front of the trailer. Can an enclosed trailer take the bumps. What about a hard stop? Do i have to strap the mowers down or will putting the mowers' brakes on be enough? Sometimes someone will forget to put the breaks on as well. My trailer takes this abuse well and i would like to know how an enclosed trailer will take it.