2011 Montana High Country 343RL 2011 Keystone Montana 343 Helium Technology: More Luxury, Less Weight. 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.