Need to replace the plywood on my open trailer. Some say not to use treated and use marine plywood instead because of the reaction to aluminum. Guy at menards says the treated does'nt have arcinic in anymore and will be fine. Also think of coating the alunimum with bedliner stuff after old plywood is off but dont know if this is necicary. Anyone have any info on this. Price difference is $24vs$80 sheet.