Kharn wrote:After looking at the frame some more, I realized I'd have to put the front jacks on the under side of the tongue. I'm already concerned with scraping the tongue due to the slopes and angles of my driveway so I went with 20" for the rear, and I'll strap a 2x3" to the tongue to test it for ground contact before ordering the front jacks.
My TD is 60x114" (or nearly 5x10'). Your jack length shouldn't have anything to do with how much they 'hang' below the chassis/tongue. Mine hang just short of 3" below the chassis (& that is at the foot, elsewhere they're just over 2", if you add the round 'footpads' that'll add about another 1/4" to 3/8"). If a 1x3 (edgewise) will clear your driveway angles then the BAL jacks should be OK. I had to devise a mounting bracket on my chassis to clear the tongue. I just welded some rectangular tubing & some 'C' channel of same dimension as the tongue metal & bolted the jacks to that. Works fine for stabilizing & I've even used the jacks to 'lift' the TD a couple of times when working on the bearings, along with a small hydraulic jack. These things are 'hell for stout'; the one on my left rear survived the rear end collision, Labor Day weekend of 2010. The collision separated one end of the jack from the chassis but only resulted in a couple of bent mounting tabs on the jack. They were easily straightened & the jack is still working good as new...
Here's how mine are mounted -
