Having just aquired our new '08 Blackjack and being faced with the dilema of having to mount a front plate, I went looking for options. I found this site, which makes a neat bracket that "clamps" on behind the front bumper and provides a mount for the front plate. It requires no drilling
and the "clamps" can be attached with the supplied wingnuts for easy removal or with 1/4" #20 nylon lock nuts like I did if you don't intend to take it off and put it back on all the time. My use of "clamp" to descride the mount is probably over simplified, but you can read the directions(which come with pictures) on the site to see what I mean. All in all, it's an easy install that takes about 10-15min and solves the front plate problem without messing up your front bumper.
http://ccmustangbrackets.com/
Signed,
Adam Stark.