Truck rentals are used for moving, for the most part. They are used for the do-it-yourself moving, whether it is in-town moving, or various one-way moves. In-town moving is where the truck will be picked up then returned to the same location in the same town, and one-way moves are where the truck is picked up from one place and returned to another.
The cost of renting a truck will differ depending on the company you are using, amount of miles traveled, truck size, and availability. As most people move on the weekend, it is usually more expensive to rent during that time.
Some companies will rent by the day, for a set rate depending on the size of the truck, where other companies rent by a daily rate and a per-mile rate. Once again, these rates can change depending on the availability and demand.
One-way rentals also are worked out on availability of trucks at the location where you will be picking the truck up, as well as the demand on them where the drop off point is, so price ranges can go up and down. The total number of days and miles you have rented the truck for are established by the departure location, and the destination, with extra days and miles...