I can't believe that hanging 300 pounds off the pin box could ever give the structure any problem. Especially when you think it is supporting 3 or 4000lbs when hooked to the truck. I don't think the structure even knows the hitch is even hanging there. That hitch would equate to 10% or 13% of what the hitch would normally have as a loaded weight. At least that is how I see it, but could be wrong.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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