My two cents
I use wood ramps I slapped together from some 2 x 8's and 1/2 OSB. Total cost about $14 as I remember. They are a little heavy, but for as often as they are used, they work like a charm. That 14 degrees is about the max angle my Z will take as an angle of approach (see drawing). You may need to go slightly less if your car is lowered.
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