Tiggs wrote:
I tried that, Gary, and sometimes those durn blocks just don't want to stay put for me.
I use the same approach as Gary suggested, and found that if you have 2 pyramids of three blocks ahead of both wheels, with the appropriate space in between, and if you drive 
slowly onto the pyramids, the wheel would not push the pyramid but instad would crawl up on it. Did this just a last weekend myself. 
Personally I prefer the strong lightweight plastic levelling blocks over wood or the banana shaped levellers contemplated. The only place I'd use wood is under the tongue jack if there is no foot (as on my RV since I use a cone-shaped jack stand to avoid excess jack travel).
But that is just my preference.