Welcome to the forum.
Within
this link you will find information on the Workhorse chassis and yes the furnace feed heat to the tank areas by the use of foil duct with a 12v fan in it that runs when furnace runs.
The link provided has instructions for finding out info when coach was built by using COM_NET. Here is a
Brochure and
Owners Guide.
Workhorse chassis is covered in
this link read sticky top of forum also in it.
I had a KSCA 2003 on WH best coach I ever had and with some adds on the new coach chassis, best in driving in cruise all the time Alinson Trans great.
The link has a check list you need to read, motor bolt mounts never a problem in my coach but other items you need to look at and in my signature will find links to your Appliances in coach.
I am on and off the forum these days will check in to see how your doing. You can find out by recalls on this forum and my friend ED Gray will help you the w-22 chassis had brake caliper recall that should be done by now and COM_NET will give them all. Just read the instructions I have given.
Good luck and enjoy the reading.