Trying to level my motorhome

SHRED wrote:
Any geometrical math folks out there?

I have a sloping driveway I want to park a 27 foot RV on but have it level. Wheelbase is 149".

I used a 2 foot level, placed it on the driveway, lifted it to level, measured the gap and it was 1 1/8".

What is the height or ramps I need for the front tires as I will be backing in?

Somewhere around 7 inches

149 / 24 = 6.2
6.2 x 1.125 = 6.975 inches

Pangaea Ron wrote:
149 / 24 = 6.2
6.2 x 1.125 = 6.975 inches

Here's what's weird.
My current RV is shorter and my ramp lift is about 11 inches total to bottom of tire.

That still isn't quite enough for level.

Is the driveway not a constant slope?

Try the level on a 8' or longer 2x4, and measure in several locations along the slope.

Pangaea Ron wrote:
Is the driveway not a constant slope?

Try the level on a 8' or longer 2x4, and measure in several locations along the slope.

It looks consistent but I'll try that.

Well this did not work. The formatting was lost.

1 1/8 = 1.125"
2ft = 24"

1.125 X
----- = -----
24 149

(1.125 * 149)
X = ------------ =6.98
24

Check the slope of the RV floor where you intend to park it instead of the driveway. Either on the blocks or off. Takes the inconsistency of the driveway out of the equation.

And unless you’re living in it in your driveway, if the ramp height gets beyond practical height for you, there is no need to have it perfectly level to use or run the fridge.
Assuming fridge on a sidewall, you can operate it safely on a 4-6% slope

Rather than placing the level on a 2x4, simply put the motorhome where you'd like to park it and put the level on the motorhome floor...and then do the math. There are a couple of advantages to this: first, you get the slope between the actual points where the tires are; and second, if you have any "built-in" slope to the motorhome due to the front or rear riding higher or lower, you take that into account.

(It also helps that you have your motorhome handy whenever you want to level it, while many people don't tend to carry 2x4s with them wherever they go.)

I made a simple little ruler-like measuring stick awhile ago that was calibrated in number of ramps--I used 2x10s of various lengths with beveled ends, stacked as needed--to get level, measuring up how high one end of the level needed to be raised from the motorhome floor. Once side of my ruler was calibrated for front-to-back leveling, the other for left-to-right. I don't really use it anymore because with practice I can now eyeball it based on the level's height without needing the scale, but it was quite handy at first.

By your measurement
1 1/8th inch rise per 2 feet of run
Just over 12' wheelbase which is slightly more than 6 times your levels length.
so six times your 1 1/8 inch equals,,,,, about 7 inches.