Under-Bed Rail System and Gooseneck for 2019 GMC Sierra 3500 Denali
Updated 10/27/2025 | Published 03/12/2025
Question:
Do you have a under bed rail system for a 2019 GMC 3500 Denali and a slider 5th wheel to match? Also would the rails work for a gooseneck?
asked by: Dave M
Expert Reply:
Hey Dave! There are no options for an aftermarket under-bed system like the OEM puck system for your 2019 GMC Sierra 3500. However, what you can use is the B&W Companion Sliding 5th Wheel Hitch w/ Turnoverball for Chevy/GMC # BW23SR. This will leave your bed completely free when not in use just like the puck system.
The Turnoverball gooseneck hitch also acts as the mounting point for the B&W Companion so you will have the option to use both depending on your towing needs. B&W makes incredibly reliable products that will give you a great towing experience so you really can't go wrong with their setup. The part listed above has everything you need for a complete installation.
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Product Page this Question was Asked From
B&W Companion Sliding 5th Wheel Hitch w/ Turnoverball for Chevy/GMC - Dual Jaw - 20K
- 5th Wheel Hitch
- Sliding Fifth Wheel
- Aftermarket Below Bed Rails
- 5000 lbs Vertical Load
- 20000 lbs GTW
- Double Pivot
- Standard - Double Jaw
- 17 - 19 Inch Tall
- 12 Inch Fore/Aft Travel
- B and W
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Robin H.
10/27/2025
Hey Dave, how did the B&W Companion slider and Turnoverball setup work out on your Sierra 3500? It sounds like a solid way to keep the bed clear when you’re not towing. Your feedback could help others looking for the same flexibility.