2007 Keystone Montana Mountaineer M-31RLD travel trailer for sale. Excellent well cared-for condition. Perfect layout for snowbirdsDimensions Length 35.5 ft. 426 in. Width 8 ft. 96 in. Height 11.08 ft. 133 in. Interior Height 6.67 ft. 80 in.Weight Dry Weight 8,425 lbs. Payload ...