How many of us are there? Owners of Dodge based RV's?

Addendum #2 -- 20 pounders are a nominal 5 gallons. 30 pounders are a nominal 7.5 gallons. (Actual capacity is slightly less ... roughly 4.5-4.7 gallons for 20 pounders.)

4.5 gallons at $2.38 per gallon is $10.71. 6.75 gallons (typical 'fill' for 30 pounders) at same price per gallon is a little over $16.

And, yes, your price for propane is considerably less than up here.