Rear bumper spare tire mounts make it difficult to install bike racks and cargo trays. They add weight and length to your travel trailer. ‘Hide-A-Spare’ Tire Storage System allows you to mount the tire beneath your trailer and out of the way. Very easy to mount and simple to remove. Three models to fit every type of trailer frame, installation is quick and simple. Made in the USA. Limited one-year manufacturer warranty. NON I-Beam Frames (C-Frame, Channel, Box, or Z-Frame) Model 28210 65" to 69" frame width, NON I-Beam Recessed mount for trailers without underbelly enclosure Model 28215 70" to 75" frame width, NON I-Beam Recessed mount for trailers without underbelly enclosure Model 28216 70" to 75" frame width, NON I-Beam Underslung mount for trailers with enclosed underbelly I-Beam Frames Model 28217 70" to 75" frame width, I-Beam Recessed mount for trailers with I-Beam frames without underbelly enclosure Model 28218 70" to 75" frame width, I-Beam Underslung mount for trailers with enclosed underbelly Not designed for use on motorhomes.