Always, always insist, demand, assure, OWNER and operating manuals on ALL the Hardware, to include wiring diagrams of unit and hardware. You must have them if anything goes wrong, if not there assure you can get them. I turned down one unit as NO manuals of any kind, All you need is one unit needing repairs and no manual and misery, same for ALL units model and serial numbers, often you can find more data to help on www, but get the numbers NOW, record them in log or such. Saves grubbing about, probably in miserable weather trying to find the hard data that is core to any repairs or maintenance. A few hours now getting data and recording it will save much grief latter on, and some day you will need it, even for all the filters etc.
Note Gig Harbor, miss the place as had sailboat moored at end of water by restaurant, lovely place then as was there before it got "discovered by Tacoma" now is?
Fully agree on CW, drove there one time and finally left after feeling like being in some sort of run down used car lot with sales folks of same type. Was a while back, but will never return. Shudder to think what would happen if we bought at one place and attempted to get warranty etc at another, plus their prices way to high.
Note: Rule of thumb with any dealer of any product for us on, if they will not post prices as "to low to post" then we go elsewhere.
NOTE I learned from buying new boat applies to RV, used or new. The operations and owner manual are critical to use. BEFORE you close deal, make part of closing/title etc this. ALL operations/owner manuals will be placed on or beside the item(S) they apply to, work with, etc. Then each item will be shown by seller as to operation, maintaining, manuals etc until you KNOW, or both of you KNOW how to operate/maintain them.
If you do not do this, you end up with a stack of paper that may or may not be there when you need it, may or may not apply to your model or they just do not have the manuals. You will some day find you need the manual, that you never got, so insist on manual next to item and remove when you know how to operate. Kind of takes care of two critical items at one time.
I learned lesson the hard way on a diesel filter on engine that seemed to only shut off when nearly wrecking place while docking, usually in front of hundreds of people whom wondered how come I even allowed to own boat, much less use it. Seems the valve I thought was shut, was not 100% so and sucked air when it felt like it at idle. I found that out when I bought missing manual