I have a Rockguard FR and my mate has the mudhugger FR. We transport them in the back of my estate, lying flat, with front wheels out and the bars turned to allow bars to also lie flat. The rockguard is longer and needs to be propped up by the forks to stop the little front bit being bent, but the mudhugger FR does fine without any special precautions.
TBH, now I’ve run it in the filth, even the long rock guard doesn’t keep you as clean as a down tube mounted guard. Sure, your face is kept virtually spotless, but from halfway down my chest I’m gopping and completely soaked, whilst with something like a THE proline frame shroud, all the fast straightline stuff gets stopped properly whilst the generally slower corners might throw a bit on your face, but its still not too bad. Going back to those on both my bikes, with little enduro-guards on the forks.