Roger likes the flexy style, which use the body lower seam as the final block to skid movement. My concern (up in the 400 days of rain per year PNW) is all the mud/crap that would be trapped there, and act as a rust source. In Calif, this may not be an issue. So mine are pretty inflexible, and positioned no closer than 1/2" to the body, to prevent mud trapping and permit easy cleaning.

I've seen rigs with all manner of rocker skid construction and flex (even one that the owner would jump on to bend back away from the body), and as long as you're happy with it, I guess it's the right one for you...

Edward, good to see you back! ...dual NP231's... Now THAT'S low gear, about 120:1 final ?