Don't forget any professional shop is going to apply the eqiuvalent of 4 gallons of material to get all that covered and be able to warranty it. Full size trucks take about 5 gallons. Multiply that times Herculiner's cost. Al's liner is an off shoot of Scorpion which is an off shoot of Speedliner, the product I use. This year I plan to experiment with Herculiner and SEM Protex on some trailers.The nice thing about Herculiner is you can go back and touch it up if you missed a spot or have a spot chip- Other coatings can't- There is also another new DIY kit out now called al's liner. Can even color match that system. I used the Herculiner on my bed and over the rails and the underside of my tonneau cover. Line-x and rhino liner whated 675-750 to do all that. I bought (2) 1gallon kits and with the rebate I only spent 120.00