Considering the low profile, can a shovel...
Considering the low profile, can a shovel and jack be mounted without hitting the vehicle?
It all depends on how high your cross bars are off the roof of your rig. Even with the low profile design, the jack will have no problem fitting. The blade of the shovel is what will most likely cause the problem if there is any- which I doubt. Usually, you can put the mount a little closer to the top edge of the rack and the tilt the shovel in.
This is a pretty sweet rack, and if your asking about a jack and shovel, you've probably got a pretty sweet rig.
Good Luck, and hope this helped.