1 section on the floor on the centerline that runs the length. 1 full length section 10 inchs off the floor mounted on sideboards that are 54 inchs apart. I am going to mount 1 section on the walls 36 inch high off the floor next week when i get home.
I also use (3) 2x4s cut to use with "e-track pockets" (8 e-track pockets) to keep freight from moving and to strap to also. and i also have 2 "fraction" cargo bars i use....and 4 straps with e-track clips and 2 with hooks to use with "e-track rings both on short straps and just on e-track clips....
Make sure you have the right stuff to strap barrels, they can be a challenge the 1st time....