I have used the 12,000 pound rated Rhino ramps that are grey in color. They hold up the front end of my 4,500 pound pick-em-up truck thingy.
No problems so far bit I am mistrustful of pert near everything.
So....... after the truck ascends the ramps I place a couple metal jack stands under the frame towards the front.
Such a minimal amount of effort and time that would pay immense dividends should a ramp(s) collapse, the ground under the ramps settles (no paved driveway here at the shanty) or if anything weird strange or bizarre happens.
Redundency.... a wondrous concept that could possibly prevent a vehicle from crashing down upon thine body. If the worst happens, one would hope for a quick painless demise. But, what if the clearance between ground and vehicle "only" resulted in slow asphyxiation due to the inability to expand the rib cage? If you can't breath in and out you could not yell for help and ye would semi-slowly lapse into unconciousness with death ready to grasp thee with its cold eternal fingers.
Or, thine ribs would be broken or perhaps thine heart bruised from the impact. So much pain!!! Agonizing pain!!!!! And, to think, the simple act of adding to the ramps... such as a couple jack stands, would prevent those unwanted events.
The choice is yours!!!!!