I have the Exp 1. The thing to consider with the Exp 1 are that the crossbars are not designed with slotted tracks. You can't mount any equipment that utilizes t track bolts. Exp 1 also does not make any brackets for awnings, en suite shower systems etc... you'll have to fab your own! Pretty much anything on the market, you'll have to fab your own brackets and tie downs to utilize the rack. Which is its biggest downfall.