$1000 was what I was told, then discount the $100 coupon that was at the rally. Larry (Cheap Heat) also said it is about a days work. So your 15 hour install for a non installer seems about right.
For someone not handy I suppose the $1000 would be a bargain. Along the same lines of the disc brake installs.
I'll use your 15 hours as a guide and figure it will be about the same for me on any trailer with some room to work with.
I got the install manual and a bunch of tips from Larry for our Cyclone, and it will be a challenge in that rig, if I can squeeze out another inch of side clearance.
I will wait until the fall, it may not be going in the Cyclone at all.