Hello Greg
I guess you have seen my post about removing the installed battery tray and opening up the battery compartment. I did this to install a 8D sized 400 amp Lithium battery. I currently have a 8D AGM as the house battery. There are benefits to having one battery, one set of connections etc. I have been looking at the SOK batteries as well. I believe I can fit 2ea 206 AH batteries in the battery compartment. If they don't fit in the compartments current configuration I still have enough room to expand the compartment. My battery compartment is 24 inches wide by 15 inches deep by a little over 12 inches high. I have enough room to increase the depth to 19 inches or just a little more if needed. So bottom line I am sure I can make them fit. The SOK batteries have some benefits I haven't found in 8D lithium batteries, like heating pads. The 400 amp 8D I was originally looking at is the same price as 2ea 206AH SOK batteries with heating pads. The real issue for me is justifying the expense (cheapskate).
I believe you are going to have to be very creative as there isn't much available room for some of the equipment you may want to install. It does sound like you have a nice coach, I wish I had liquid springs. It seems those that have them, love them, and I would imagine you'll end-up feeling the same way.
I wish you the best of luck and if there is any question you have just message me and I will help where I can. There are a lot of knowledgeable people on this forum, with a lot of good input. I've learned a lot from them, I hope you have the same experience here as I have. Welcome to the PC Family!
Very Respectfully
Lance