thats a nice little unit but def too small btu wise for the Landmaster2 Extreme. the avg human puts out about 400 btus plus moisture, you'd need atleast 8,000btu to make up for the people and equipment on board not to mention heat load if its in the sun, ever better with 12,500btu for a roof mount RV style from coleman or a quality Delongi 12k portable if you have room inside to store it. to give you an idea of the capacity of the automotive ac system an 70-80s gm car with R-12 and a 3.75 pound charge could put out almost 36,000btus of cooling power just something to think about in sizing ac units