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UnderCover (RealTruck) RealTruck UltraFlex (GEN 3), UnderCover Ultra Flex

A tonneau cover from UnderCover (RealTruck): hard tri-fold, 400 lb load rating. UnderCover (RealTruck) makes it for 1 truck generation, each with its own part number and conditions.

By the FitsMyTruck team. Figures come from UnderCover (RealTruck)'s own spec sheets and fit charts, with 50% of the entries from retailer listings where UnderCover (RealTruck) publishes no figure, part numbers are checked against the live listings, and the page is reviewed before it goes up. Last reviewed Oct 24, 2026.

The UnderCover (RealTruck) RealTruck UltraFlex (GEN 3), UnderCover Ultra Flex in brief

The UltraFlex is a hard tri-fold cover with aluminum panels, sold by UnderCover, a RealTruck brand, and listed under the names RealTruck UltraFlex (GEN 3) and UnderCover Ultra Flex. The maker lists a distributed load rating of 400 lb and a 5-year warranty, and the install method is clamp-on with no drilling. The maker site is undercoverinfo.com. We have one part number for it so far, UDC-UX32009, for the 2019-2026 Ram 1500 with a 6ft 4in bed. That makes the fit narrow for now: one truck, one bed length and no part numbers for other makes or bed sizes. If you drive anything other than a Ram 1500 with the 6ft 4in bed, we cannot tell you what fits, so check the maker's own fit finder before you buy.

hard tri-foldCover type
aluminumPanel material
400 lbDistributed load rating
5 yearsWarranty

Specifications from the maker

hard tri-foldCover type. page says "hard-folding"; three panels (tri-fold) is not stated on the page text read
aluminumPanel material
400 lbDistributed load rating
5 yearsWarranty
clamp-on, no drillInstall method. drilling may be required on some applications

Which part number is yours

There is a single part number, so the choice is short. UDC-UX32009 is listed by RealTruck with the title Fits 2019-2026 Ram 1500, 6ft 4in Bed. That is the only truck, bed length and year range we have for this line. RamBox status is not stated for that part. A summary of RealTruck's Ram 1500 FAQ says you must choose a RamBox-specific model to keep the RamBox bins usable, so if your Ram 1500 has the RamBox option, confirm on the listing that UX32009 is the version meant for it before you order. We also cannot say whether the Multifunction Tailgate changes the answer, so look for that wording on the listing too. Both points come from a search summary and not from RealTruck's own page, which is another reason to read the listing text yourself. Before buying, match three things: the part number, the 6ft 4in bed length and the RamBox question.

Trucks it fits

  • 2019-2026 Ram 1500

    • Fits 6.33 ft bed, UDC-UX32009

    RealTruck lists UX32009 for 2019-2026 Ram 1500 with the 6ft 4in bed. RealTruck does not say whether it works with RamBox. Confirm with the maker before ordering.

    All tonneau covers for this truck

Before you buy a tonneau cover

Questions owners ask

Which Ram 1500 bed does the UnderCover UltraFlex UX32009 fit?

RealTruck titles UDC-UX32009 as Fits 2019-2026 Ram 1500, 6ft 4in Bed. It is the only part number and the only bed length we have for this line.

Does the UltraFlex UX32009 work with a RamBox?

RamBox compatibility is not stated for UX32009. A summary of RealTruck's Ram 1500 FAQ says a RamBox-specific model is required to keep the bins usable, so confirm on the listing.

What are the UltraFlex load rating and warranty?

The maker lists a distributed load rating of 400 lb and a 5-year warranty. The cover is a hard tri-fold with aluminum panels, and the maker site is undercoverinfo.com.

Does the UltraFlex need drilling to install?

The maker lists the install method as clamp-on, no drill, so no drilling into the bed is called for. No drilling exceptions are listed for UX32009, the one part number we have for this cover.

Where these figures come from

Every figure above is UnderCover (RealTruck)'s own, from its spec sheets, fit charts and install guides, checked on Oct 24, 2026.

2 maker documents
  • RealTruck (UnderCover), manufacturer product page (read in browser pane), read Oct 24, 2026
  • RealTruck (UnderCover), search-result title and summary of manufacturer product page (page not fetched, WAF challenge), read Oct 24, 2026