Don't know anything about this flavor, but do make sure that they'll work for the _weight_ of your van. My familiarity is with the military run-flats; it's an internal solid rubber tire inside the inflated tire. We drove, albeit no more than 35mph, for almost 40 miles on one of those runflat inner tire things. Worked great, and saved our butts.
HOWEVER, some have reported marginal performance when used on uparmored vehicles. Basically, it couldn't take the extra weight.
My point is: make sure it'll take the weight of your probably-really-heavy vehicle!
2006 RB50 6.0 Diesel
Flatplate water heater (mounted INSIDE), portable butane stove (no propane)