Level Master Trailer Level - This giant 11 inch x 2-3/4 inch, all-in-one RV level provides visual side-to-side and front-to-rear leveling assistance for trailers, 5th wheels and motorhomes. Level Master can be viewed from the drivers seat to help locate the best level location for parking your RV. Each mark on the side-to-side scale indicates one inch of blocking. The front-to-rear scale is adjustable and can be easily viewed while operating your tongue jack. This level comes with easy-to-install instructions for installing on your trailer or motorhome. Backed up with a 1 Year Limited Warranty.