Originally Posted by cruiserjohn
Looking to buy a used motorhome with a tow rating of at lease 7000lb.
I am looking a an older diesel pusher . what length would I need to get
Length is not a factor nor is tongue weight if towing 4 down. Tongue weight applies to the downward pressure on the hitch and is generally between 10-15 percent of the trailer weight. When towing 4 down there is virtually no tongue weight. You also need to find the Gross Combined Weight Rating for the MH. The GVWR is the single weight that the vehicle can carry. The GCWR is the combined weight of the vehicle and towed item. So if you are 26,000 pounds GVWR and 30,000 pounds GCWR, it allows for a 4000 pound vehicle/trailer. I'll wager there are a lot that are over the GCWR.
The manual or the manufacturer will tell you what your towing weight should be and what the tongue weight, if needed, on the receiver hitch.