OK, 16,200 GVW, 12,700 on the axles, 3200 on the pin. Trailer wants to porpoise while towing, In other words the rear drops down while the front maintains the same height, causing a up and down movement on the truck. What can be done to correct this?

Good question. That would be a lot of weight behind the axles

If it is in fact the rear of the truck bouncing up and down, either an air pinbox, or a air hitch would absorb most - to almost all the movement you are seeing. In addition airbags would tend to lessen the rebound of the rear springs on the truck when whatever motion is left occurs.

I would check the pin weight with the trailer fully loaded, garage full and all. My bet the pin is too light. Filling the fresh water tank may help, if it is forward of the axles.

Airbags completely stopped the purposing in my set up.

Front to rear Porpoising | Good Sam Community

24 Replies

eHoefler
Explorer II
May 01, 2013
I would check the pin weight with the trailer fully loaded, garage full and all. My bet the pin is too light. Filling the fresh water tank may help, if it is forward of the axles.
christopherglen
Explorer
May 01, 2013
If it is in fact the rear of the truck bouncing up and down, either an air pinbox, or a air hitch would absorb most - to almost all the movement you are seeing. In addition airbags would tend to lessen the rebound of the rear springs on the truck when whatever motion is left occurs.
Goostoff
Explorer
May 01, 2013
Good question. That would be a lot of weight behind the axles
big_buford
Explorer
May 01, 2013
Is the jeep in the WW?

Forum Discussion

Front to rear Porpoising

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