I don't have those exact ramps but had an instance with my Pantera where the ramps were on a smooth surface and when backing onto the ramp one of the wheels gripped the ramp and threw it forward under the car. Nothing damaged but maybe just watch doing it on real smooth surfaces.
For sure, the slicker the surface the more you'll want to be mindful. They appear to be designed with material to "grip" the ground and fortunately were easy to work with for me. $40-50 to boot, great way to quickly get the car in the air. I also think that the AWD of the LP640 helps...you have the front wheels pushing in reverse along with the rears so less likely to have a negative outcome.
The race ramps I already had were not a low enough angle (car has 3" ground clearance in the front, no lift as its aftermarket coilovers). Raceramp makes a great product and if I had to throw them in a trailer that's what I would buy because of weight, but for what I wanted to do I would be spending over $1,000, so I built my own out of ~$150 of wood which allowed me to not only work on the car but do alignments & corner balancing.
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