We've used the stable stix in the drive way @ home and posted pics here, this is the first time we took the camper off the truck in a campground because they have paved drives @ brookville, they worke...
FYI a pick up bed cargo rod will do the same thing to "assure" a nervous camper in the cabover (It will never tip over with normal use). Two cargo rods can also be used as a makeshift tailgate after you remove the TC. You can also use extendable sheetrock stands which have a greater extended length.
I recommend you take the TC jacks all the way down unless you have a solid base underneath.