I have been researching these last few days- after checking countless message boards and forums the best the general consensus for the best porta-potties is Thetford brand. The higher the model number- the higher the seat and greater capacity.
They are sold pretty much everywhere- Walmart, Canadian Tire, etc. I also see them for a lot less money on ebay.
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Posted by Linda- Home and Garden Ideas as Camping, Camping: Accessories, Camping:Pop-Up Campers, General Home and Garden at 10:45 AM EDT