Old propane tanks on new RVs

Take the tanks to a BIG propane dealership. They should be able to re-certify the tanks for about $10 each or less. Then the cost to fill them. I get mine re-certified at a local Southern States farm supply store. We have about 8 tanks we use for aux supplies for the RV, BBQ's, torches and a mess of other things around the farm. I'd also notify Coleman corporate folks that the dealer is putting WAY out of date old tanks on their new rigs and then charging exorbitant prices to make it good. They may not do anything, but need to know what their dealers are doing.