I haven't seen any mysefl, but I am guessing that it will be difficult to find fixings strong enough to hold the boards on. Normally on 4x4 cars they have special mounting holes in the chassis.
If it were my mother in law, I would jack up the suspension and make it even harder to get in so that we could leave her behind
thaught about fitting side steps to . i have a 1997 ulysse also thought about an a bar for the front the wife went mad no way she said .its not over yet ill get my way 1 set of shogun side steps weld up some brackets and job done [well i can dream] one day soon