http://www.pullpal.com/aboutPP.html
Good anchoring system, but can be fabricated if you have the skills and tools
http://www.extremeoutback.com/index.cgi?cart_id=814819.2496&pid=50
This winch works really well. Unlike a come-a-long, it works on both strokes of the handle, and will handle unlimited lengths of cable.
I have not tried it with static line, but I have friends who have and say it works.
To release the load, simply click a lever and work the handle back and forth until the line is slack, then it will free wheel.
Comes in a variety of different load capacities. The heaviest is in the 60 lb. weight range. Plenty strong for a normal rig, but a chip truck is real heavy.
Might want to set a smaller 4x4 out past where you need to go, anchor it with a pull-pal, then attach a block to it with a doubled line going back to the chip truck.
Sticking 'pickets' or 'T' stakes into the ground in an attempt to create a solid anchor does not work, Tom.
Pickets pull out, bend, are next to impossible to pull out when set in solid ground, and can be run over and puncture a tire or oil pan. Especially when the rig needs to be pulled right up to the anchor point (which it usually does).
The nice thing about the pull-pal, or similar device is that it does not need to be buried into a deep hole and then dug out. Storm anchors used in sailing are typically used in this fashion.
Hope this is helpful
Frans