I am sorry but this is the 70 inch and not the 84 inch...I don't know which one I own. However, 70 inch would be just fine for dirt biking. I don't own a quad. It might be a little weak for a snowmobile. Especially for climbing into a truck bed. For a trailer I don't see a problem. The cross rails are a little far apart and make things difficult with flip flops, but for the money I like it. Stores easy and carries easy.