I am using Frosting King self adhesive duct insulation. There are a lot of threads in a lot of forums on
sound proofing a vehicle. And there are a lot of opinions out there on the subject. One of the common themes is that your truck cannot be soundproofed. It is actually "sound deadening". What you are trying to do is reduce the noise caused by the vibration of your truck's steal body panels, thus changing the frequency of the vibrations. To stop the panel from vibrating, weight equal to 3 or so times the panel's weight must be added. That is impractical. Fatmat, Dynamat and the like are "generally" product made of butyl rubber, aluminum backing and an adhesive - simplified. Peel and Seal has been used, and there are number of videos on the subject. The issue most have is the smell. Peel and seal is a tar based product. I used Tite Seal as it more butyl rubber based.
The product you are looking at has jute as the insulator. Some form of closed cell foam is better as it helps create a barrier that absorbs sound that passes through the butyl rubber layer. Adding a third layer of closed foam completes the package.
This seems to be the basic system sold by all the commercial sound proofing suppliers. I order some 1/2" closed foam from Zoro.com.
We used it under the front carpet. I also use Blue Hawk Gray Anti-Fatigue Floor Mat from Lowes under the carpet between front and back seats. it is thicker and I think I like the product better than the closed cell foam for under carpet. The mat has a hard coating to help with blocking sound.
And finally, I put an tread mill mat from Academy Sports in the rear, cargo area. I had this and the thinner material will work better for the box we plan to put in.
The fatigue mat can be purchased at $4.95 a foot, 3 feet wide. I want to compare that to cost of Dynamat and Fatmat. Lesser costing commercial materials are said to be thinner, requiring the application of 2 layer, or more, bring the cost back up to that of Dynamat or Fatmat. I have not compared pricing, but the Frost King covered a lot of Truck. I used 6 rolls covering floor, sides, roof, doors. We may put some under the hood.
I may have paid as much as would have had I purchased the fat mat for the closed foam layer. I am going to glue some I had left over in the roof, between the spars to help with sound absorption.
There are several threads on sound proofing, just do a search.
Hope this helps.