I have RokBlokz on mine. They flex a good amount. They got caught on an albeit small ledge when offroading once, but didn't cause any damage to the truck or the mudflap mount.

If you can find something softer like rubber or a very flexible plastic ones they will flex more and be less likely to get caught on anything.

 

Definitely a valid concern. I bought the WeatherTech "no drill" mudflaps, and they look great...but I haven't mounted them yet. In part because with the 35's I just installed, they may not fit without rubbing, but I think they will. Also, I had the same concerns about hanging up over a ledge and bending sheet metal. So, what I plan on doing, is using just the mounting and a little bit more, and drilling holes and attaching softer generic rubber flaps underneath. This way they can flex over a ledge instead of hanging up and breaking. Also, I think I'll slit the rubber from the hole to the edge so that if they catch, they can pull off without having to try and tear the tough rubber, which would probably bend sheet metal. I'll probably make a slot from the hole to the edge, about 1/2 the diameter of the screw, and use nylok nuts that won't vibrate loose. This way, even if the screw loosened up a little, it really couldn't fall off, it would have to move the rubber around a little. I figure the combination of friction and clamping down on the rubber a little should prevent them from falling off, yet allow it to easily pull off if they get hung up. My theory anyway...

 

Any chance you live near Houston, TX? You are the kind of neighbor I need. Just joking. BTW, the other guy on the trail had WeatherTech mudflaps. They worked great keeping the mud from his ZR2.

 

It depends on how significant 4 wheeling you do. If you’re just plunking around in 4lo, climbing steep hills, and doing the occasional rock feature, you’ll be okay.

If you’re fully flexed out often, you will absolutely rip off your mud flaps. I’ve ripped off one or more flaps on every truck I’ve ever owned. I watched my buddy’s Tacoma fender flair come off with the mudflap a couple weeks ago.

I think the other thing worth keeping in mind is that flaps will really help with rock chip prevention. For a lot of people, that is well worth the risk of ripping them off.

 

Going back to the day when I did, I made my own flaps which were nothing but an oversized hinge.
Pull the pin and they were off. Kept them on for mud days, off for rocks.
I haven't checked in a while, but I think jeeps had something similar, maybe look there for ideas.

I offroaded pre-internet, so we had to use our imagination and off the shelf stuff from actual stores.

 

I hear you, many times I know what I want, but then have to pick from Home Depot sone thing I think could be made to work. What I need, is a big, local McMaster-Carr store where I can just walk in and buy stuff.

 

Nothing like shopping for an item that only exists in the back of your mind, when someones asks if they can help, I say its a thing a ma bob what fits into a whicha ma call it

 

I am actually quite shocked that nobody has invented a thin, super flexible, type of fender flare extension that can be cut to fit and just use the factory inner fenders fasteners to hold it in place. Decades ago someone did that for atvs when you turned them into swamp machines.