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I'm leaning towards a ladder style roadbed made from PT lumber since it's widely available and I'm comfortable working with wood, but I've read mixed reviews of the method overall, especially from wood vs HDPE, etc.,
I have not heard of any problems, other than the usual issues with subsidence of the supports, and wood deteriorating over time. The layouts I am familiar with have 'plastic' (HDPE?) and are painted, and they have been fine for 5+ years to my knowledge. What have you heard?

If you are going to move in 3-4 years, I don't see a problem.
 
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