For Sale: 5th Wheels / Fife, Wa 2015 Keystone Rv Montana High Country 318re 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 1300-2500 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.