Huge lot of free pallet wood, what to do

I was in the local borg today and there was an entire cart of pallet stringers free for the taking.  I took them.  About two thirds are green (probably CCA treated) and about two thirds are heat treated and have the wheat stamp.  1 1/2" x 2 1/4" x 44". I was thinking of using them in a fence, particularly the CCA treated wood since I assume it will hold up to the elements better.  I would never buy pressure treated lumber but keeping it out of the landfill seems better?  Anyway I'm wondering if this would be good to use in a fence.  If I set the stringers 6" apart I probably have enough for 150' of fence.  I'd need a base, probably earthbag. I welcome any thoughts.  

You have 'packing ' timber used a spacers with sheets of timber and the groove holds plastic or steel belting.
If you don't use pressure treated timber, I guess you need to purchase a better quality timber so the fence will not rot off at ground level.
I use steel posts often, set into cement reinforced soil [ spadeful of portland cement tp 6 spadefuls of soil and mixed then rammed into the hole;

Yes, that is exactly what it is.  Packing timber spacers.  Do you think the pressure treated ones would be good as fence slats if I had an earthbag base?