Answer
Apr 14, 2016 - 10:43 AM
Not knowing your application, I can tell you that the Hide A Spare is not for motorhomes. They do not tell you a size on the tire you can use, but it can hold up to a 100 lb. tire. Here are the different types of trailer underbellies and frames it can be installed on. Hope this helps.
 | Enclosed Underbelly - when a trailer has a sheet of plastic, fiberglass, aluminum or other material that is installed horizontally beneath the trailer frame. This sheet is attached from front to back and from Driver’s to Passenger’s side frame rail. It protects the bottom of the trailer from road debris and the elements. The Hide A Spare that is ‘underslung’ will work on an Enclosed Underbelly trailer. |
 | Recessed Underbelly - this is a trailer that has no material concealing the bottom of the trailer frame. When looking underneath the trailer, you will be able to see waste tanks, electrical and plumbing lines, wiring, and the bottom of your trailer floor. You will also see the exposed frame rails and crossmembers (steel supports running from one frame rail across to the other frame rail). Using this model will allow you to recess the spare tire up into the frame limiting ground clearance loss. |
 | Underslung - Hide A Spare that is used with Enclosed Underbelly trailers. It allows the spare tire to be positioned below the frame as opposed to recess into the cavity between the frame rails. Underslung models should be mounted as close to the axles as possible as it decreases ground clearance |
 | I-Beam Frame - each frame rail will look like a capital ‘I’ from the end of the trailer. Each side of the frame (passenger and driver) will have a horizontal lip on the lower, exterior edge. The Hide-a-Spare fitting the ‘I’-beam frame will have brackets that are designed to avoid this lip. |
 | Other Frame Types - frames that are not ‘I’-beams will have a flat, smooth vertical surface. These are called Box, Channel, ‘C’-frame, or ‘Z’-frame. They will not have the lip the ‘I’-beam and will have a flat, vertical bracket can be used on the Hide-a-Spare |
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