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Old 07-05-2017, 02:51 PM   #1
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Driveway angle vs. rear overhang

Hey everyone...

My wife and I are currently building a new home in a subdivision that will have RV parking on the side next to the garage. Based on current grading for the front driveway, it looks like I'll have a bit of "hill" to drive up to get to the RV space. I don't think it'll be a problem but I'm a tiny bit concerned that my rig is so long that the back will scrape the street - or worse, the hitch will bottom out - before the rig clears the "hill."

Is there a mathematical formula I can use to determine how much of an angle I can climb without scraping the back? I'd like to be able to measure it first without damaging the street or my rig... that way if we need to regrade the drive we can.

Any help would be greatly appreciated Thanks!
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Old 07-05-2017, 02:57 PM   #2
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Following. It's like a high school geometry problem. I'm waiting to cheat off the smart kids answer :-)
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Old 07-05-2017, 02:59 PM   #3
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Following. It's like a high school geometry problem. I'm waiting to cheat off the smart kids answer :-)
lol... exactly!
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Old 07-05-2017, 03:03 PM   #4
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Back in if it drags more grading needed the only sure way.
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Old 07-05-2017, 03:10 PM   #5
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Back in if it drags more grading needed the only sure way.
Hmmm... is there an "un" sure way, cuz that doesn't sound very practical
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Old 07-05-2017, 03:25 PM   #6
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Originally Posted by Racklefrack View Post
Hey everyone...

My wife and I are currently building a new home in a subdivision that will have RV parking on the side next to the garage. Based on current grading for the front driveway, it looks like I'll have a bit of "hill" to drive up to get to the RV space. I don't think it'll be a problem but I'm a tiny bit concerned that my rig is so long that the back will scrape the street - or worse, the hitch will bottom out - before the rig clears the "hill."

Is there a mathematical formula I can use to determine how much of an angle I can climb without scraping the back? I'd like to be able to measure it first without damaging the street or my rig... that way if we need to regrade the drive we can.

Any help would be greatly appreciated Thanks!
Maybe forward your questions to the contractor. Hopefully the side of the garage where the RV will be park is level and be terrific if full hook-up is available. Good to plan ahead.
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Old 07-05-2017, 03:31 PM   #7
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You could take the dimensions to your local high school geometry teacher who could likely figure it out mathematically. The problem is you would need precise height measurement of your driveway, street and curb which might be difficult to measure with precision.
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Old 07-05-2017, 03:34 PM   #8
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Take a look here https://www.vcalc.com/wiki/KurtHeckm...rture%29+angle


https://en.wikipedia.org/wiki/Approa...parture_angles
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Old 07-05-2017, 03:35 PM   #9
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Just thinking out loud. Take a string line and stretch it (tight) between the bottom of the front tires and the bottom of the hitch (measure the height of the hitch and set a wood block at the side to support the string) along the side of the coach. The distance from the ground to the string beside your rear tires is the maximum depth you can have before the hitch will touch. (mark the string where the front tires, hitch and rear tires are).

Stretch the string on the driveway. If the depth is less than measured on the mark you should be good. Try the string in several places.

This will also depend upon having the same weight and loading in the coach.
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Old 07-05-2017, 04:49 PM   #10
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You can calculate it using trigonometry, but I wouldn't trust the calculation because it would assume the street is perfectly level and the driveway is perfectly flat and both are unlikely. Here's a link to a rise and run calculator which might be useful to you. Put in the run -- the length of the portion of the drive you are worried about, and the pitch angle (2/12, 4/12, 6/12 etc.) and it will calculate the degree of the angle for you.

https://www.blocklayer.com/riserun.aspx

You can use that angle with the information from rgvtexan to calculate the departure angle of your coach and the approximate angle of your driveway it will tolerate.
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Old 07-05-2017, 06:22 PM   #11
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I am a simple person. I would measure from the center of the back wheel to the back bumper and then measure from the ground to the bottom of the bumper. Take a 2"x4" and zip tie it to the back bumper using the frame for leverage so that you can approximate the distance behind the axle and the height. Then have at it. Either it will scrape or not.
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Old 07-05-2017, 06:30 PM   #12
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What's the length of the overhang and the angle of the driveway?
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Old 07-05-2017, 06:36 PM   #13
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Driveway angle vs. rear overhang

Quote:
Originally Posted by Racklefrack View Post
Hmmm... is there an "un" sure way, cuz that doesn't sound very practical


How about measure from your back wheel to bumper and from the ground to lowest spot to determine the degree of angle.
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Old 07-05-2017, 06:40 PM   #14
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Dumb question since I figured you have already checked but does the subdivision covenant allow you to park a motorhome in your driveway? Most don't including boats, campers or trailers of any kind.
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