With a dual axle trailer you'd want to use two Andersen leveler sets, one for each of the two low side tires. Most love 'em for the ease of use, a few don't because they present a fairly narrow footprint which can be problematic on a soft ground surface, being made of hard plastic they'll slip on a hard surface such as tarmac, some claim to have broken one, and the biggest issue - lack of sufficient space between adjacent tires to allow the leveler to rotate as the trailer is pulled up on to the levelers without jamming against one of the tires. Andersen does include instructions detailing how one might trim the thinner edge of the leveler to shorten it but that also increases it's minimum lift. Some owners have also profiled the thick end of the leveler to better clear the tire. In my case neither solution would work as my Coachmen has 14" tires on a mere 29" axle spread so no matter how short I might make them they just won't fit. Finally, my own personal concern - if the trailer is parked on a site that slopes significantly to the front or to the rear I'm not convinced that the wedge would prevent the trailer from rolling away. A non-issue now for me since I decided to pass but it's a concern you might want to consider.
