Sounds like a little more detail is needed for what it means to level an RV, so I'll take a crack at it:
1. Back into your space and orient the trailer/MH where you intend to park. Stop. Do not unhitch yet.
2. Put your tow vehicle in park and set the parking brake.
3. Exit your vehicle and check the side-to-side level of your RV. Do not worry about front to back level at this time.
4. Based on the level, determine the number of 2x8's, Legos, or other items that will be placed under the tires of your RV.
5. Note where the tires are positioned on the side that needs to be lifted to make your RV level. Place the leveling items next to where the tires are (along the outside).
6. Enter your vehicle and pull forward in a straight line just far enough to clear the area that was covered by your tires (about 3-4 feet).
7. Place the leveling items on the spot where your tires were/will be.
8. Slowly back up in order to have the tires roll onto the leveling item(s).
9. When on the item(s). Stop. Do not unhitch yet.
10. Put your vehicle in park and set the parking brake.
11. Exit your vehicle and check the level on your RV. If you estimated correctly, your RV should be level from side to side. If not, you need to pull forward off the item(s) and repeat steps 6 though 11. As you gain experience, you will be able to do this the first time (though there are times I have to repeat this).
12. When leveled side to side, stop, put your vehicle in park, and set the parking brake.
13. Chock your RV tires front and back.
14. If you have a fifth wheel, lower your front landing gear about half-way (this gives you room to raise or lower your FW in either case for a site that is not level front to back, yet still be able to lift/lower your FW from the bed of the truck. Pull the pins to extend the landing gear to the ground. I typically put 12"x12"x1" boards under the landing gear "feet" to help minimize trailer movement, especially on gravel or asphalt surfaces.
15. If you have a regular travel trailer, do the appropriate steps to allow the trailer to become unhitched and ultimately leveled front to back later on.
16. Unhitch your trailer from your tow vehicle.
17. Enter your tow vehicle, release the parking brake and slowly move forward just enough to clear the hitch.
18. Stop and unplug any power connectors between tow vehicle and hitch.
19. Pull completely away and complete the front to back leveling, which is raising or lowering the front jacks/landing gear. Remember, you've already leveled side-to-side before unhitching.
20. Once your trailer is level, lower the rear stabilizing jacks to where the pads just touch the ground. Again, I use 12"x12"x1" boards to maximize foot space to minimize trailer movement. After the pads touch the ground, turn no more than 1/4 turn to have the pads become firm on the ground, but not lifting the trailer.
You should now be completely level from side-to-side and front-to-back. If not, go back and see where you might have missed a step.
Hope this helps.
Lou Leopold
2001 Dodge Ram 2500 Diesel Quad, SWB, 3.55:1, Rhino Lining
2000 25' Mallard M-23 5M 5th Wheel
Husky 15K w/EZ slider
Wen PowerPro 3500 Generator in a sound box
And I continue to tent camp!
One other piece of advice. If your landing gear are not touching the ground at the same time, adjust the leg length until they are touching at the same time or as near as your pin holes allow. Do not torque the frame by having one leg supporting the load and the other still off the ground.
F-250 PSD, 30ft Prowler, 18ft Bass Boat, 2 big dogs,
Boondocking at Rio Costilla, NM
To follow up on Agbat's post, you can get these for one leg of the 5th wheel jack and get very close to having both front legs touch at the same, or almost the same time. Very easy to install and it works as advertised.