My "old style" boards require you to do a lot of drilling to mount them. The "new style" utilize existing holes & make the installation very easy. Believe me, the "new style" is the one you want.
I don't believe the "new style" boards mount as easily under the bed of the truck. In other words, I think the "new style" boards are ONLY EASY to install under the cab of the truck, not the bed.
Best bet would be to talk to a Dee Zee distributor/installer & find out for sure. When I bought mine, I talked to two Dee Zee Reps. at a truck store show. Both showed me & insisted that they were easy to install. But, they sent me the "old style". I should have returned them but, thought "how hard could it be"? (I'm not much of a mechanic. )
To make matters worse, after I completed the installation, I drove back to the truck store & complained to the Mgr. about them sending me the wrong boards & how much trouble I had installing them. He said, "
Gees, you should have brought them back & we would have installed them for free". I could have shot him, & then myself.
At any rate, I got them done & the haven't fallen off the truck, yet.
If you decide on the Dee Zee's & would eventually like to have some side marker lights on the boards, drop them a bit to allow room enough for the lights. There is an upright, vertical piece that is a couple of inches tall & would be a great place for side marker lights. The vertical piece mounts under the cab of the truck. I mounted mine a bit too far up & under the cab, not leaving enough room for marker lights. Just a thought.
Joe F. (Buffalo)