Sooo, basically the biggest issue with these composite beds is the friction coefficient—or lack thereof lol. Everything slides! I was actually pretty disappointed with the fit of some high-end liners I tried previously, they just didn't stay put.

You might find this useful: check out the Harbor Freight Haul-Master Ratcheting Cargo Bar. It's usually under $20 and literally stops gear from sliding around without blocking that trunk lid like a net does.

If you're looking for a budget floor fix, honestly, look at the Tractor Supply 4ft x 6ft Rubber Stall Mat. It’s only about $50. You’ll have to trim it yourself to fit the Santa Cruz dimensions, but it’s way thicker and grippier than the WeatherTech TechLiner Bed Liner mentioned earlier. Pro tip: there's a great resource at the 'Hyundai Santa Cruz Forums' specifically for 'DIY Bed Mods' that'll save you hundreds. gl!

Before I give advice, I gotta ask—how heavy is the lumber you're planning to haul? Knowing the weight distribution is huge for safety cuz the SC has a specific payload limit and you dont wanna mess with the rear axle's center of gravity.

In my experience, if you're on a budget but want safety, skip the $300 OEM extender and look at the MaxxHaul 70231 Hitch Mount Truck Bed Extender for about $65. It's way more stable for long loads. For the sliding, I'd suggest the Dee Zee DZ86705 Universal Heavy Duty Rubber Bed Mat which is around $55. It's super grippy rubber so gear basically wont budge. Plus it's flexible enough to reach the trunk easily! Ngl, cheap insurance is also getting Rhino USA Ratchet Straps 4-Pack for $35 to keep everything locked down. Gl!

Seconded!

Sooo, from a market research perspective, I've looked into this a TON because the SC bed is such a unique puzzle. Honestly, if you're worried about the slick floor, skip the factory mat. I've found the Dee Zee Heavy Duty Bed Mat offers the best friction for the price. It's thick rubber, so gear LITERALLY stays put, and you can easily trim it so it doesn't mess with trunk access.

For the bikes and lumber, look into the ReadyRamp I-Beam Compact Bed Extender/Ramp Combo. It's way more functional than cage-style extenders cuz it doubles as a ramp. Also, check out the SmartLiner All Weather Custom Fit Truck Bed Mat—it's usually cheaper than the big-name brands and fits the composite floor perfectly. Basically, going aftermarket saves you cash and usually gives you better utility than the OEM stuff. gl!

Honestly, the bed design on the SC is kinda frustrating for those of us who actually haul stuff... it looks cool but functionality is hit or miss with some of these mods. I spent way too much on stuff that just ended up in the garage because they didnt fit as well as they claimed or they blocked the trunk. Before I suggest the DIY route I took, what kind of mountain bike setup are you running? Like are you trying to keep the front wheel on or are you okay with a fork mount? Also, are you planning on hauling that lumber every weekend or is it just a once a month thing? Knowing your budget would help too because some of the pro solutions are honestly overpriced trash imo.

In my experience, you gotta get the Hyundai Santa Cruz Bed Extender! You're gonna need the WeatherTech TechLiner Bed Liner too cuz that factory floor is way too slick, right?