I back up onto leveling jacks a few times a year, never had a problem with either my PC or prior to it my Lexington or my Minnie. I have always used either the Lego style blocks where I stack them so each step up is only 1 block, or I have used the ramps that only go up 1" at a time.
Maybe I am lucky, or maybe PC modified the mud flap placement and size in 2015? My mud flaps about 2" off the road and maybe 4" behind the tire at the closest point between the two.
I should get a pict and or measure that once I get it back from the shop.
Don