[commodor47]

Holly,

The propane tanks on our unit (SL) are horizontal and cannot be conveniently swapped out.

I've had both my OEM propane tanks re-certified within the past two years at our local propane company store (in my case AmeriGas). You don't need to be a customer to have your tank certified. Each time it cost $25 including filling the tank. The certification is good for 5 years. They basically do a visual check for rusted fixture connections with the tank body and the base support ring. The test also includes a pressure test, looking for a defective valve assembly. I periodically remove any rust, prime and paint the tanks before bringing them in for certification or as needed. I am not sure how much they would charge to re-certify a 5 pound tank.

Dick