Increasing Turning Clearance by Replacing a 1621 5th Wheel Trailer Pin Box

Question:

i have a lippert pin box1621 im looking for something that is a extention or longer pin box any ideas longer

asked by: Raj

Expert Reply:

Extended pin boxes aren't designed to be a longer version of shorter pin boxes. They're just models that are longer. So when you're looking for a replacement for your Lippert 1621 pin box it's not as easy as just finding one that's longer. A replacement 1621 pin box is going to have the same dimensions as the factory 1621 you already have.

I assume you're looking to extend the length in order to gain turning clearance between your truck and trailer. If this is the case your best option is to replace your pin box with a Sidewinder. Sidewinders have a rotating turret so the pivot point is moved back 22 inches instead of where the king pin is coupled to the hitch. They're the best solution to increasing turning clearance and make it much easier to tow with a short bed truck.

We have three Sidewinders that are direct replacements for your 1621:

# RP34FR rated for 20,000 pounds
# RP61422 rated for 16,000 pounds that also includes an adjustable air spring to smooth out your trailer's ride.

expert reply by: Charles S