As many have said the real cost is going to be the labor from Oliver to do the different changes. I have the 390 AH lithium package simply because they were switching from the lifeblue to lithionics and I got the Lithionics at the old price. ($500 cheaper). The Lithionics are excellent batteries but there are many cheaper options that would work just as well. If considering changing the batteries I would also look at updating the wiring and adding a solar controller or sizing a new one one large enough for an external panel setup. Olivers factory wiring job under the streetside bed leaves much to be desired. Regarding the Truma upgrade I would consider looking at the Houghton that many of us have installed. It is just as quiet as the Truma but also includes a heat pump function (saves propane) that will keep you warm down to about 30 degrees. I was the one that got the quote for $5200 to change out the refrigerator. Way to expensive for me to consider so I will do it myself when the time comes. As always, upgrades depend on your ability, your checkbook or both!! ๐
John