I found that Hidden Hitch Co. makes an adjustable width mount hitch for RV use and was wandering if anybody has installed one on their 5th wheel and what are your thoughts? They say they are for motor homes but it sure looks from the installation instructions that it should bolt right up to our 07 Montana 3400RL, with 71" between the outside edge of the C channel frame. Any help would be great and thanks for the info and thoughts.