hi wahoonc and others
i really do like the enkays. the basic truck flaps don't offer complete coverage so for me adding the nks do....after fitting i drove in the mud lookin for gaps in coverage, adjusted the nks to fine tune the gaps.
the flaps cosmotini links in the first post appear to mount, such that, no hitch/receiver mods are needed.....for the nk's the receiver must be longer or the bracket modified...others have posted photos and info on this modification.
i suspect the really large metal and rubber flaps wahoonc has, provide enough coverage, and adding another set would not be cost effective....given the trailer is already sandblasted down low....now if it was ever repaneled or traded for new......
there are several threads on rock tamers, mub flaps and so on, in the archive. lots of nice homebrew'd and tweaked versions.
here's the thread i like (i wonder why) and it does show how each set of flaps can "catch" different items (caution bad taste/humor ahead).....