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Steep driveways, curb cuts, and uneven campground entrances are a common source of scraped frames and dragged tongue jacks. This mini roller mounts to a weld-on 1/4 in. steel bracket and lets those trouble spots roll under the rig instead of grinding against it.
Its compact 1.5 in. x 2.5 in. steel wheel is sized to fit tight, low-clearance locations where a full-size roller won't work, and the all-steel build is meant to take repeated contact without giving out. A grease (Zerk) fitting is included so the roller can be lubricated to keep turning freely over the long run.
Since it's a weld-on mount, plan on having it installed by a welder or shop familiar with your frame if you're not set up to weld it yourself.