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When these RV's are built, the manufacturer has to maintain a balance between strength and weight. The stronger the frame the heavier the weight. If I have my facts straight, beginning with the 2003 models the frame was beefed up a little. However, Keystone still does not recommend adding any kind of additional cantilevered weight beyond the back of the Montana. It is not just the weight. It is also a function of the distance from the supporting axle.
A cantilevered weight subjects the frame to the most severe stress at the point of the rear axle. The severity of this stress is magnified when weight protrudes from the rear. The frame of your unit was not designed to compensate for these kinds of physical forces. These are the laws of physics, not just scare tactics from some engineering cowards.
To get a mental image of what I speak, pick up a ten pound weight with one hand. Not too hard. Now tie the ten pound weight to a fifteen foot pole, then pick it up with the other end of the pole. The difference is significant.
All this to say, if you are going to add a cycle lift, you need to beef up the frame all the way back up past both axles to ensure you don't break off your tail someday on less than stellar road surface. That would be an aweful comsplateration.
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