Numerous reasons possibly dirty fuel injectors, if its a 4 wheel drive could be different sized tires.
It can also be a tire out of balance, bent wheel, or bent driveshaft.
I don't know you tell me.
It might be a broken motor mount or transmission mount.
Loose motor mounts.
Unbalanced front wheel.
could be the fuel pump
Trucks need gas.
Check for warped front rotors. under slight brake application it may not shake. But under hard braking such as getting off an offramp the truck will shake and the brake pedal may pulsate slightly. Chances are real good this is your problem.
You would need to go to truck driving school, in order to become a truck driver. Many ads in the newspaper offer truck driving jobs, so it would benefit you to call them for more information.
bent wheels or a broken cord in a tire or a deformity in a tire.
This happens mostly when it runs out of fuel.
the ground to the battery i had the same problem on my truck
You can find free truck driving games on the computer at www.gorillaarcade.com/racing. Or if you would prefer to purchase a game you could find a truck driving game at GameStop.