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WOW!! You just made me realize that happened to me also.. never realized what had happend though.. way back before i knew any better.. i had 3- 3" pvc tubes in one 5 gal bucket with sand.. lol.....

Totally understand that!! Shipping will definitely be a factor.. but sometimes convience and piece of mind is worth it.. ! I was thinking about mentioning that too.. can get some 5 gallon buckets...

Never made a rack for 5" myself.. but i would think its 2x6 for bottom and sides.. 3/4 pine or plywood for side supports.. a piece of 3/4 in between each one

So your at 36" for bottom plate
2-...