In their description it states:
UNKER INDUST Off-Road Traction Boards with Jack Base,
Pair Recovery Tracks 4X4 Jeep Truck Tire Traction Mat with
Bag -Sand,Mud,Snow Ladder Ramps(Red)
With that being stated, there are two claims I would be highly critical of:
- Jack Base
- Ladder Ramps
Regarding the Jack Base: The reason being, If it's really cold out, (snow) and you place that on the snow for a base for your HighLift, I would wager that it will: 1) buckle and bend or 2) more likely, because of the cold become brittle, crack and break.
Ladder Ramps are used to span a crack or crevice, maybe a not much more than a foot or so wide. Even my MaxTrax will bend unless I have about 3 or 4 of them stacked. I really don't think just two of the above boards stacked will support your GX over a span.
But those are just my thoughts and unless myself or someone else has tested them, take my opinion as a grain of salt, something to spice up your thoughts with in deciding which to get.