What your truck is doing has been referred to as the "death wobble" and it is basically free play in the tie rod which allows the tires to start moving independantly of each other. Big tires, wore out shocks, bad steering components, bad alignment can add to the cause of the problem, and when it happens, it's pretty freakin scary.[/QUOTE]
Scary is an understatement. One of the techs who used to work at our John Deere dealership had it happen to him twice. He promptly traded his Dodge for a Chevy when in it put him in the ditch at 65 mph. One of our excavation customers had it happen to a dually one ton towing a double axle gooseneck equipment trailer with a skid steer and a mini-excavator on it.
The truck, trailer, skid steer and excavator all went over an embankment along Flathead Lake. The excavator took the worst of it (next to the truck of course), damaging the cab and rear cover. It ended up underneath the skid steer on the back of the truck. The front axle of the truck was completely ripped out from underneath the front end. The skid steer only suffered a couple of bent oil lines for the boom auxillary functions. They were able to use it to clean up the site. Both the mini-excavator and skid steer started just fine.
(Of course, the trailer being somewhat overloaded with both pieces of equipment on a 1-ton truck didnt help matters any). The driver walked away with just a few scratches. I don't have a picture of the wreck, but it was a mess!
Scary is an understatement. One of the techs who used to work at our John Deere dealership had it happen to him twice. He promptly traded his Dodge for a Chevy when in it put him in the ditch at 65 mph. One of our excavation customers had it happen to a dually one ton towing a double axle gooseneck equipment trailer with a skid steer and a mini-excavator on it.
The truck, trailer, skid steer and excavator all went over an embankment along Flathead Lake. The excavator took the worst of it (next to the truck of course), damaging the cab and rear cover. It ended up underneath the skid steer on the back of the truck. The front axle of the truck was completely ripped out from underneath the front end. The skid steer only suffered a couple of bent oil lines for the boom auxillary functions. They were able to use it to clean up the site. Both the mini-excavator and skid steer started just fine.
(Of course, the trailer being somewhat overloaded with both pieces of equipment on a 1-ton truck didnt help matters any). The driver walked away with just a few scratches. I don't have a picture of the wreck, but it was a mess!