Yes it is the blazer tank from Classic Industries.
I got the peal and seal in the roofing and flashing section at Lowe's. It is actually made for window flashing. All sizes were 33 ft long in widths of 4", 6" and 9". I got the 9" for $14. I used a lot. I used 5 1/2 rolls. I doubled up on the back wall and under the seat. Then tripled it on the floor. I also did the doors so when I close them they don't rattle and they sound solid.
