Wheel-to-Wheel Running Boards: Which Bed Lengths They Come In and Why the Bed Decides

Here is the part most shops skip: a wheel-to-wheel board does not care only about your cab. It has to span the distance between your wheels, and the bed changes that. Buy by the cab alone and you can end up with a board the wrong length.

Straight talk on what we can offer. No listing in our Amazon data says wheel to wheel or names a bed for a board. So this page has no Amazon pick and no buy button. What it has is the maker rows that show how these parts are sold, so you can shop them properly. For cab-length parts on Amazon, use the picker on the home page.

Rows from the maker

We read these LUVERNE pages on November 2, 2026. "Box" is the box length LUVERNE prints. The pages do not state a unit, but LUVERNE ties 76.3 to a 6-foot-4 bed and 67.4 to a 5-foot-7 bed on the Ram 1500.

These are samples, not a catalog. We did not read a row for every truck, including a current Silverado 1500. Run your truck through LUVERNE's lookup. LUVERNE has more on how its kit numbers work.

Why the bed decides, and what else does

The bed picks the board. On a Ram 1500 crew cab, moving from the 5-foot-7 bed to the 6-foot-4 bed moves you from a 98-inch board to a 102-inch board.

The cab can flip it. LUVERNE's 114-inch F-150 board is listed for a crew cab with a 6-foot-6 bed and an extended cab with an 8-foot bed. So the same board length serves two different trucks.

The bracket stays truck-specific. Look at the F-150 and F-250 rows. Both use the 114-inch board, but the bracket number differs: 401530 and 401733. Do not swap them because the board matches. LUVERNE ships boards and brackets separately on these kits.

The page can disagree with itself. The description for 415098-400940 says "Quad cab with 6'4" bed and regular cab with 8' bed", while its table lists Crew and Extended Cab. The title for 415114-401733 names the F-450, while the table lists no F-450. When words and table disagree, ask LUVERNE and do not pick the version you like.

Want the theory with a picture? Bed and cab fitment covers it. Do not know your bed length? How to measure bed length takes a tape and a few minutes.

Should you buy wheel to wheel at all?

Take wheel to wheel if you work out of the bed and want somewhere to stand while you reach over the side. Skip it if you only climb into the cab. In that case, the shorter step typically costs less and is listed far more widely, and best running boards has our picks by truck.

Who makes them

LUVERNE. Grip Step is a 7-inch aluminum board with expanded metal treads, built for work trucks. MegaStep is a 6-1/2-inch board, and O-Mega II a 6-inch oval. The Grip Step pages list a rocker mount and say the brackets use pre-existing mounting points. Warranty wording on these pages reads "limited lifetime warranty (five-year finish, one-year parts)", and LUVERNE's warranty excludes more than that line suggests, as our LUVERNE page sets out. The pages state no load rating. The weight shown is shipping weight, so do not mistake it for capacity.

Westin. The HDX Drop page says "available in cab length or wheel to wheel" and tells you to select by truck, cab and bed configuration. It lists wheel-to-wheel part numbers in steel and stainless, with a vehicle lookup. It states no load rating on that page. See Westin.

N-Fab. We could not read it. n-fab.com now redirects to RealTruck, and RealTruck's product pages came back empty for us, so we print no fit here. See N-Fab.

Common mistakes

• Buying by cab alone. A crew cab is not one length of truck.
• Trusting a retailer's bed note over the maker's table. Use the table, and call when it is unclear.
• Reading shipping weight as load. It is not. See how much weight running boards can hold.
• Assuming a 2500 row covers a 3500. LUVERNE lists them on separate pages, with different lengths in the rows above.

Where to go next

Pick by what you drive

• If you drive a Ram 2500 or 3500

  Ram 2500 and 3500

• If you drive an F-250 or F-350

  Super Duty

• If you drive an F-150

  F-150

• If you drive a Silverado

  Silverado

• If you only need access to the cab

  Cab-length picks

Our verdict: buy wheel to wheel only if you will stand on the back half. If you will, start with LUVERNE's lookup, match the box length to your own tape measure, and confirm the bracket number before you order. How we verify fitment explains why we quote those rows and do not extend them to other trucks.