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Old 04-01-2014, 03:57 PM   #1
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Driveway slopes.

OK, so I've seen a couple threads here about a steep driveway causing a problem with motorhomes dragging their rears on the street pavement when pulling in. We are finalizing plans for a new home (and RV garage!) and there have been some complications in the lot elevations. Is there a minimum slope that is usually needed to avoid this unfortunate phenomenon? The driveway slope will be either 7.7 degrees or 9.1 degrees for the first 42 feet, with a level sidewalk adjacent to the street. The sidewalk is 4" above the street. Is the 9.1 steep enough to cause this problem? And no, I don't have airbags.

Alright experts, spread your knowledge!

When I get home this evening I will post a photo showing the slopes diagrammed. The 9.1 looks like possible trouble.
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Old 04-01-2014, 04:04 PM   #2
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Each coach is different due to wheelbase, overall coach length, ride heigth , rear hitch configuration, and length of coach past rear axle. I suppose there is a way to figure it mathematically. Personally, I would drive coach to a similar sloped area and check it real time.

Note ........ most W24 chassis have significant rear overhang past drive axle
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Old 04-01-2014, 08:33 PM   #3
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Here is the rendering of the driveway. This is not my moho. I have a single rear axle that hangs over 13 ft from the rear axle. The hitch is 22" high. The rear leveling foot pad is only 10" off the ground and 46" behind the rear axle, so I think that may be in more jeopardy than the hitch. The wheelbase is 20'3". What do you guys think, is 9.9 degrees fairly common for a driveway?[/URL][/IMG]

Come on, where are the high school trig teachers?
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Old 04-01-2014, 08:55 PM   #4
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Quote:
Originally Posted by JeffAZ View Post
OK, so I've seen a couple threads here about a steep driveway causing a problem with motorhomes dragging their rears on the street pavement when pulling in. We are finalizing plans for a new home (and RV garage!) and there have been some complications in the lot elevations. Is there a minimum slope that is usually needed to avoid this unfortunate phenomenon? The driveway slope will be either 7.7 degrees or 9.1 degrees for the first 42 feet, with a level sidewalk adjacent to the street. The sidewalk is 4" above the street. Is the 9.1 steep enough to cause this problem? And no, I don't have airbags.

Alright experts, spread your knowledge!

When I get home this evening I will post a photo showing the slopes diagrammed. The 9.1 looks like possible trouble.
The only way to really know if it will work is to make a to-scale template of your motorhome in profile view (take the measurements with it loaded as you would when driving it up the drive). Then lay out the driveway, sidewalk, gutter, street crown, etc. profile at the same scale on graph paper. The larger the scale, the more accurate the process will be. Then graphically drive the motorhome up the drive to see where your critical points are and if the grade will work.

If it were me, I would use 2' x 3' engineering, plan size, paper that has the grid printed on it (cross section paper).
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Old 04-02-2014, 08:52 PM   #5
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Never saw any pics? I'm curious to see them because I have a long rather step incline driveway at my home in Tennessee and I'm concerned I will not get my MH up the driveway without some changes to smooth out the pitch at the bottom and the crest on top.

Hope all is going well on your driveway and would love to see it.
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