Changing Mariner Holding Tank

[TomDempsey]

Greetings all. We have just joined the Carver family. I'm due to take possession of a 2006 36 Mariner in about a week. We looked at several different Carver models before deciding on the Mariner, and eventually chose it because it suited everyone in the family from grandparents to grandkids. The one major drawback for is was the 20 gallon holding tank. I noticed some of the newer Mariner models have a 31 gallon holding tank. Obviously Carver listened to owner feedback and/or reviews and increased the size of the tank on later models. I'm wondering if anyone knows how difficult it is to replace the 20 gallon holding tank with the larger 31 gallon tank, or if this is even possible? Our express cruiser had a 45 gallon tank which really reduced the amount of trips to the marina for pump outs.