...Also, what prevents this thing from allowing the entire mechanism of the jack to pull itself into/under the dirt? We all know how *well* hi-lifts work when they are clean, throw a little dirt into the mix, and the jack is almost useless until its torn apart and cleaned. I know the pull palls often have to get pulled under VERY deep until it starts working. Just curious... neat idea for sure. Just wondering how well it actually works..
A dirty hi-lift is a dangerous hi-lift and now you are compromising one recovery device to build another.
My other concern is using the hi lift mast in what could be a bending moment. For the two 'authorized' uses Hi-Lift designed for, the mast is used in pure compression (jacking) or tension (winching). When setting a winch anchor its very possible for it to dive at a varied angle, not inline with your pull, would worry me.
We discussed using the Hi-Lift mast as the main beam for a winch anchor device in the past. The biggest pro was weight and space savings for the vehicle. However I pulled apart my Pull-Pal and figured the net weight savings was just
7 lbs assuming you used the mast for a pull-pal like setup. The setup in this thread is obviously different and far lighter
You can read about that here:
http://www.expeditionportal.com/forum/showthread.php?t=15064
My logic was this. Sure, the entire Pull-Pal represents a lot of weight, but I'd guess that the beam itself isn't going to save you more than 10lbs. (later measured to be under 7 lbs) Consider my complete Pull-Pall weights 34lbs, 36lbs with the case... add to that I don't carry a Hi-Lift (26lbs) rather an exhaust jack (15 lbs)... I'm at a net savings. Not that I'm honestly ever worried about 10 lbs in a 7500lb setup