Welcome aboard Hot Rod !
You have come to great web site for your project. There is a wealth of knowledge on this site and many have "been there done that" on about any problem you may encounter. They have saved me many "do overs" with their advice.
I am also building a Toterhome on a Kenworth W900 chassis to pull my race car trailer. I chose not to go with the overhead bunk. My research found the roof cutout significantly reduced the structual integrity of the cab and the cab to box seal can be a problem. I deceided to go with two 76" slide-outs instead.They appeared to be less challenging than the roof cut-out/seal problem. I have my box framed in and generator installed. I am ready to install the holding tanks but like you I am looking for input for sizing the tanks. I only have 26"x29"x72" space to place them. Almost any size and shape tank can be purchased on Ebay or one of the RV surplus places. I am just not sure what the tank ratio's should be.
Again welcome to the site and I am looking forward to following your project.
MMM
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