I noticed in your first post that you said you had traded up to a Montana. What I don't know is whether you traded up "new" or "previously enjoyed". If new, the hitch may adversely affect your warranty. If beyond three years, it is a moot point. If beyond three years, there may be a frame issue due to Keystone using a lighter frame beam in earlier models. If you have the larger frame beams, then your concern will be the loading physics related with adding 120 lbs plus the weight of the hitch behind the axles. It is not just a function of added weight, but the cantilevered force related the distance from the rear axle. Additionally,you want to make sure your pin weight is not too light.
By-the-way, I am not an expert in this field. So seek further counsel well beyond me. Just my thoughts. Sure hope you get this issue resolved.
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