"Access the underside of your tractor-trailer to perform routine maintenance, service, and repairs with these low profile semi-truck service ramps. Specially designed to accommodate semi-trucks with low clearances or front spoilers, including the Freightliner Cascadia series, these ramps can accommodate any Class A commercial vehicle, RV, or school bus weighing up to 15,000 lbs. per axle. The ramps' extra-long design spans 11-1/2"" with a 4.4° incline and a knife-end foot for a smooth transition and slope. Each ramp weighs just 106 lbs. for hassle-free transportation and placement. Extra-wide, serrated rungs provide superior traction for any tires, even in humid or damp conditions, and are recommended for Class 8 rubber wheels or smaller."