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Could I Pull a 21 ft Trail Lite Fifth Wheel Trailer with my 2004 Toyota Tundra Short Bed Step Side

Question:

I have a 2004 toyota tundra stepside. why cant I find a 5th wheel hitch that will work? and why is the stepside so different? My 5th wheel trailer is a trail light 21 ft. and has agross weight of 4400 lbs. Any help would be greatly appreciated.

Expert Reply:

There is possibly a way to pull a fifth wheel trailer with your 2004 Toyota Tundra, but you cannot install a fifth wheel hitch in your truck.

I spoke with our installer, who has installed many fifth wheel hitches, and he told me that the reason you can not put a fifth wheel hitch in a 2004 Toyota Tundra with a step side bed is that the bed rails are too narrow to allow a fifth wheel to fit between.

If you installed a Curt Gooseneck for the Toyota Tundra, 2004, part # C625-665, in your Tundra, and then installed a Ranch Hitch Universal 5th-Wheel-to-Gooseneck Coupler Adapter w/8 inch Offset for Short-Bed Trucks, part # AM3139, on the Trail Light 21 ft. with a gross weight of 4400 lbs there is a chance that you might be able to pull your trailer with your Tundra.

In order to determine if you would have enough clearance with the 8 inches of offset that the # AM3139 you will need to plug some measurements from your truck and trailer into the following formula.

(A + B) - C = Clearance

A = Distance from center of gooseneck ball to truck cab

B = Length of extension from the offset # AM3139 (8 inches)

C = Width of trailer divided by 2 (to get half)

From the installation instructions from Curt I found that the center of the gooseneck ball will be 35 inches from the cab of your truck. The rest of the measurements I am not sure of but I will use typical measurements to show you how the formula works, but this is NOT accurate to your setup. There are many variables that I do not know, like if your trailer has an extended pin box, or if your trailer is tapered at the front or not.

In this formula (A) will be the 35 inches from the gooseneck to the cab. (B) will be the 8 inches of offset that the # AM3139 has. (C) will be 72 which is the typical distance of an 8 foot trailer with a tapered front.

(35 + 8) - (72 / 2) = (43) - (36) = 7 inches of clearance

You want a minimum of 4 inches of clearance for when your truck and trailer are at 90 degrees, so with these measurements you would be okay. Hopefully your trailer has a tapered nose, or an extended pin box to give you more clearance.

When I spoke with the representative he informed me that extended pin boxes can only be purchased from the manufacturer of your trailer if yours does not have one.

expert reply by:
Jameson C

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