Check your timing
Yes it would
It alows your truck to top out at a higher speed then it would with it on.
It would not affect anything. the size does not mater.
Could be as simple as getting an air bibble in the gas tank. Try taking the fill cap off and then putting it back on.
That all depends on the size of the box truck and whether it is empty or not. An elephant would have an easier time putting an empty box truck on its side than a full one, for instance.
The tub would eventually empty
engine stalls at low speed
Yes it would better to you use rabbit speed on a narrow electrical pallet jack when taking off of a Canadian Truck Line because it would be more safer.
If it is your voltmeter that drops while the vehicle is running. Most likely the alternator isn't putting out enough volts.
could be the fuel pump
Some typical truck equipment would be a hitch, bed liner and running boards. Some truck owners like to have grill guards and mounted tool boxes as well.
A bad abs relay would cause this.