How to make an engine pallet/crate?

i have used rubbermaid (?) trash cans for transmission storage. if I remember right i used a 44 gallon one. i will check it when i go outside. i have the one that you can get wheels for the bottom of it. they can withstand some weight, i used them when i moved for the rocks out of my fishtank, one of the cans is heavy enough that it takes 2 to lift it.....