Comprehensive Review: Demco UMS Series Gooseneck Trailer Hitch for UMS Series Base Rails Video

I appreciate you getting me the picture of your dimensions but it's not totally clear exactly what you have dimensionall. Instead check out the picture I attached that shows the dimensions of the mounts on the Demco #DM5988 that you referenced.…

It looks like the 18k Demco 6077 5th Wheel Hitch mounts on industry standard 5th wheel rails. To install a gooseneck ball on these rails, I recommend the Demco Premier Series Gooseneck Trailer Hitch item #DM5996. This plate will give you a 25,000 lbs…

I was able to go out to the warehouse and measure the center to center mounting posts for you on the #DM5988. I found that the center to center on the pin on the connecting same side of the bracket is 13-1/2 inches. The distance from the c2c of the…

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

The one really big downside to gooseneck towing is that there isn't a great solution for short bed truck clearance unlike fifth wheel towing. With fifth wheel hitches you can use a slider hitch and have the clearance issue handled. With gooseneck…

You do not have to use a sliding 5th wheel hitch in a short bed truck. In many cases, truck beds shorter than 8 ft do not have enough clearance between the trailer and truck to execute sharp turns. This is why sliding hitches were invented. Due to…

The Ram OEM 5th wheel puck system, shown in the linked photo and article, was launched in 2013 so what you have in your truck is likely to be an aftermarket installation of some kind. These newer Ram trucks with the factory prep can directly accept a…

The measurement of the Replacement Hitch Ball for B&W Turnoverball Underbed Gooseneck Hitches - 2-5/16" #BWGNXA2000 is 2-1/2 inches by 2-1/2 inches by 4 inches. The ball on top of this shank is 4-1/16 inches tall. The hitch pin hole is…

For the UMS underbed fifth wheel rail kit you have installed in your 2015 GMC Sierra 2500 all you'd need is the part #DM5988 and you'd be set.

Since you have a set of Underbed Demco Rails part #DM8551009 installed in your truck you can use the gooseneck adapter part #DM5988 that you referenced.

The Demco Rail Kit part #DM8551010 that you referenced is a confirmed fit for your 2015 GMC Sierra 2500 Short Bed. The gooseneck hitch adapter you would need to go with this rail kit is the part #DM5988.

When connecting a gooseneck trailer to a big rig truck like your Peterbilt, you will need to change the trailer wiring from the commercial style to a RV style connection. Using a kit like the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole…