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Discussion Starter #1 (Edited)
Reverse Logic has published its Race Ramps trailer ramp calculator on Google Docs. This spreadsheet tool compares 20 different Race Ramps models as well as your existing trailer ramp (or trailer door) to help identify the best fit ramp for your car/trailer combination. This is a shared document, so the variables will be set to the measurements entered by the most recent user of the tool. Google Docs does allow you to download the tool and use it on your local computer which will improve performance. The spreadsheet is fairly large and takes a few seconds to redraw the graphs when you change the variables. The tool is not really usable on a smart phone due to the shear size of the spreadsheet.

The calculator displays inch-by-inch car-to-ramp clearance over the supplemental Race Ramps model and your existing ramp. The calculator takes into account the decrease in car-to-ramp clearance once the rear tires start to climb the ramps. However, the tool does not calculate the breakover angle clearance as your car crosses over the rear edge of the trailer deck. This step has to be completed manually.

The step at the high end of the trailer ramps can vary from 1" to 3" depending upon the ramp model. A few ramp models also can accommodate a flap at the end of your trailer door. Currently, the spreadsheet calculator does not adjust the clearance values where the existing ramps (or door) rest on the Race Ramps. This means that there could be a slight increase or decrease in the clearance at that point depending upon how well the ramp step matches the thickness of the ramp.

Click on the graph below to open the Google Sheet.

The overhang value entered in the tool is the distance from the front axle to the most forward point on the car. For an open trailer you only need to be concerned with the clearance in the tire path until the car reaches the trailer deck. For an enclosed trailer, the clearance along the centerline of the car is more important.


Trailer_ramp_clearance_graphs.png

Overhang_drawing.png
 

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Discussion Starter #2
I forgot to mention the order in which the ramps appear in the trailer ramp calculator.

The first entry shows the path of your car climbing the existing trailer door or trailer ramps WITHOUT an additional supplemental Race Ramp.

From that point on the ramps are listed from the most shallow to the steepest.
 
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