2017 Montana High Country 381TH Front Living With Rear Toy Hauler. Must See Floor Plan! High Country's Helium Technology utilizes advanced materials and manufacturing technology to significantly reduce weight while maintaining all the features, comforts and luxury you expect in a Montana. Because Helium Technology saves you 1,300 - 2,500 pounds compared to typically equipped fifth wheels, you can reduce wear and tear on your tow vehicle, improve fuel economy and maximize the towability of your 3/4-ton truck.