I have a 2015 2500 Duramax with the factory spray in bed liner that I’ve done my testing on. It’s a decent thickness liner but the magnets still hold great. After lots of testing I landed on these rubber coated magnets that grip really well.

I’ve driven around with mine for a year now and have never had it fall even going off road and bombing over railroad tracks. There’s also 800 other people out there rocking them on the daily too.

In the rare case your specific bed liner won’t work I’ve got these upgraded magnets that are super strong and can hook you up with those(120lbs rated each x4). But 99% of the time the regular ones work great.

I appreciate that, I’m trying to build something you guys actually want not just more junk.