to roll one of these cookers, you do not use 2"x 4" boards.
you would use plywood.
for a 32, I would use 3/4" thick plywood. it comes in 4 feet x 8 feet sheets.
you will need two sheets.
put one in front of the crate, at the ramps edge (ramp is part of the crate). roll cooker onto plywood.
put 2nd sheet of plywood at far edge of 1st sheet of plywood. roll cooker over onto 2nd sheet of plywood.
move 1st sheet to far edge of 2nd sheet and repeat the roll and move plywood sheet process until you arrive at your desired destination.
if you are moving uphill with the leap-frog plywood sheet process, you should have two, or more, wedges to place behind each caster to prevent it from rolling backward when you stop actively pushing it uphill.
with the 32" cooker, I would definitely enroll the assistance of two folks who are capable of pushing the 900+# beast CAREFULLY. you cannot man handle this.
And definitely do NOT pull it by the lid handle.