just go pull up on a curb and measure the distance from the bottom of the tire to the ground then plug that distance into this website and it will tell you what you have scored...no need for an actual ramp..
Height " 32 guessed
Wheel base " 113 guessed
23 Deg. RTI 712
30 Deg. RTI 566
But you still have to go high enough to lift a tire.... go on a loading dock somewhere...