Good news and news.... Here goes. I tried to call Dometic direct today and that was a no go. It appears they changed their customer service call in system. The public can no longer call them, you have to have dealer number. They appear to accept email questions though. This is something new as I was able to talk to customer support last January. Here is the email for retail support https://www.dometic.com/en-us/us/contact-us
I called PPL Motorhomes in TX who I have bought Dometic parts from before and they can call Dometic being they have a dealer and can get tech questions answered on the parts they sell. They are very helpful that way.
First off, your older Dometic or any other Sunline up to the 2007 models, which had the Brisk Air AC units, have been replaced with the Brisk Air II. They redesign it and it will replace the older Brisk Air systems. This happened a few years back.
Here is the situation. As of last year, Dometic has discontinued making the redesigned Brisk Air II 11,000 BTU roof unit like yours and any other Sunline that had one. They now only offer the 13,500 BTU and the 15,000 BTU units. The 13,500 would still work and fit in your camper, it will just run less to cool the camper down. The 15K unit I feel is too big even though it will fit.
Here is the Brisk Air II 13,500 BTU roof unit, white color shroud. It comes with a new roof gasket on it. Model B57915.XX1C0
At Dometic's site https://www.dometic.com/en-us/us/pro...specifications
At PPL Motorhome's part site https://www.pplmotorhomes.com/parts/...tioners_B57915
The roof unit is in stock
Now the next problem, your older air box will not line up with the air intake and exhaust holes on the new Brisk Air II roof unit. This means you need to get a new Air Box with the controls. The mounting bolts come with the air box. Dometic no. 3314851.000
On the Dometic site https://www.dometic.com/en-us/us/pro...on-box-_-49998
On the PPL site, https://www.pplmotorhomes.com/parts/...ls_3314851.000
PPL is out of them right now, they sold out last week. Seems with Covid, there is a rush on fixing up old campers. They could have them back in stock in a few weeks.
Freight, the roof AC units ship truck freight. This could be a $100 to $150 adder pending on where it ships too. For PPL it will come out of Huston TX.
I picked PPL as I can talk to them and get tech questions answered. Their prices go on sale and many times beat out many others. You can shop around if wanted, Camping World has them on sale now, but they are a little higher on prices. Not sure on the freight. Amazon has them, I am cautious on buying a unit that big from them due to the shipping. Dyers RV out of Phoenix AZ has them, but they are out of stock right now. Their price is higher but free freight, https://www.dyersonline.com/dometic-...pper-unit.html
The 14" x 14" hole in the roof is the same for the older Brisk Air or the new Brisk Air II.
You stated you thought about maybe not replacing the AC unit. Well, that 14 x 14" hole will accept a 12 volt Max Air roof fan if you want it. Or a 14 x 14" crank up roof vent.
Hope all comes out well with the insurance guy.