It is pretty damn tuff when prep is good and you even remotely follow the instructions. It is not bed liner tough, but stout and dampens steel differently than linex/rhino. it would work well for what you want to do, but I would cut rubber mats to go over it. Footwells, trans tunnel and rear floor. I am a big fan of the 1/2” stall mat material you can buy by the foot. I have it in my cj5. It makes a huge difference.
For sound deadening lizard skin
is just one step in a multi step process. On the hood of my k20 it is lizard skin, closed cell foam, mass loaded vinyl and closed cell foam aluminum. I did that to keep as much of the 24v Cummins rattle from transferring through the hood to the windshield. The down pipe is wrapped in two layers of exhaust wrap with a thin lead sheet(12lbs worth) around the pipe between the layers of exhaust wrap.
The inner fenders are are coated completely on the wheel side, dynamatt on the top side where it can’t be seen in the engine compartment. The valve cover and oil pan have blankets, lots of little details to make it reasonably quite. The truck did over 6000 miles from South Carolina to KOH and back this year. The effort to reduce the noise made it a very comfortable trip.