most times it is the trailer plug on back of truck
No - you do not need to have the truck running.
No
No you can not , That is what makes and keeps the engine running
sounds like the timing is off
changing the oil every 3000 miles, that is the life of a vehicle regular mantainence
Brakes will be dependent upon what type of truck you have and what you are doing with your truck. There is a website that can help brakeworld.com will help walk you through the right selection of high performance brakes for your truck.
Quick Service brakes and parking brakes.
This varies based on the model of truck. First determine if your truck has drum brakes or disc brakes. See related questions and links for more specific details on replacing brakes for specific models of Ford trucks.
Yes. However, the truck must be wired for a trailer equipped with electric brakes.
keeps you from putting car in gear unless brakes are pushed. I have been doing that wanting to put the truck in gear but it is not happening. It is still stuck in park.
If this problem occurs, then it means that there is a problem with your car. You can get the brake line fixed by visiting a technician.
Check the proportioning valve.