Trailer Ramp Tips

Trailer Hauling & Loading

Trailer Ramp Calculator Identifies Best Ramp for Your Car/Trailer Combination

Race Ramps offers several standard Trailer Ramps. They range in height from 4" to 11" and the length varies between 45" and 131". The incline angles range from 3.5 degrees to 8.7 degrees. Race Ramps Trailer Ramps are intended to supplement your existing trailer ramps (or trailer door) to decrease the ramp incline to accommodate the approach angle on your car. Race Ramps must be placed on the ground. They can not be used as a "bridge" to reach the trailer bed or some point mid-way up the existing trailer ramps.


In addition to the standard Race Ramps trailer ramp models, Reverse Logic offers several custom 2-stage incline and progressive incline trailer ramps manufactured by Race Ramps to Reverse Logic specifications. The progressive incline trailer ramps feature an initial incline as low as 2.2 degrees for very low ground clearance cars.


The correct ramp for the job is not always immediately apparent, and sometimes it may be necessary to design a custom ramp. While the angle of approach of your vehicle is important information, it is not the only factor. You also need to consider the break-over angle as the car moves from the ramps to the trailer bed. The transition angle from the Race Ramps Trailer Ramps to the existing trailer ramps (or trailer door) is another consideration.


1) The first step in choosing one of the trailer ramps is to determine the approach angle on your car and then selecting a trailer ramp with an initial incline that will accommodate this approach angle.


2) The second step is to confirm that the car can safely transition from the incline on the Race Ramps trailer ramps to the incline on the existing trailer ramps (or door). Generally speaking, if the incline on the Race Ramps is 66% or above of the incline of the trailer door, then the car will clear without plowing into the trailer door.


3) The third step is to determine which ramp will raise the existing ramps (or trailer door) so that the incline of the door is less than the break-over angle of the car. If the trailer door is too steep then the car may bottom out when it straddles the door hinge with the front tires in the trailer and the rear tires still on the door. A quick way to estimate the break over clearance is to make the following calculations:


a) Determine the difference between the trailer deck height and the height of the inclined trailer door at a distance of half the wheelbase from the door hinge. For example, if the wheel base is 106", then check the trailer door height 53" behind the door hinge. The Reverse Logic trailer ramp calculator displays the inch-by-inch height along the length of the trailer door for 20 different ramp models.

b) Divide the difference determined in "a)" by 2 and compare the results to the ground clearance midway between the front and rear axles. For example, if the rear tires are 6" below the trailer deck when the car is straddling the trailer door hinge, and the ground clearance between the axles is 4", then the estimated break over clearance will be about 1". Calculated as follows: 4" - (6"/2) = 1"


As complex as the above calculations might seem, there are additional factors to consider. Such as, whether or not your trailer door has a ramp flap extension, the thickness of the trailer door, or whether or not the trailer is parked on a slope.


Reverse Logic created a trailer ramp calculator that accomplishes the first two steps above and graphs the path of the front edge of the car over the Race Ramps and trailer door. The calculator compares 20 different Race Ramps trailer ramps using a few dimensions from your car and trailer. You can open this Google Sheet calculator by clicking on the graph below.







Race Ramps Trailer Ramp Calculator

Click on the graph above to open a Google Sheet that traces the path of your car over 20 different Race Ramps trailer ramp models. Simply enter 5 dimensions for your car and trailer to select best fit ramp for your car/trailer combo.

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