Here is a site that HR has manuals available.
https://www.holidayrambler.com/owners-manuals/
Unfortunately they only have a 97 Endeavor listed BUT there should be some description of winterizing that would be close to yours.
FWIW.
I don't put the Pink antifreeze into the water system, wife did not like the idea so I simply blow the lines. But I live in E TN where temps don't get that cold. Been doing this for 27 years on two different RV and never had a problem.
I have an air adapter that I put into the water inlet that I can attach an air compressor to, set the pressure at ~35 psi. Larger compressor so it has volume.
I drain the water tank and put the anode back in.
I then start the compressor and open one faucet and let it blow until no water comes out and then go to another faucet/shower. Go around to all the faucets multiple times
Flush the toilet several time.
Blow the fridge water line
Run the washer/dryer through a cycle.
When I'm done blowing lines I pour ~quart of the pink stuff down each P trap and some down the toilet. At this point I've closed the black and gray water so the pink stuff goes to the tanks.
Finally drain the water heater again and then remove the screen from the water pump and make sure it is empty, then pull fuse on water pump.
I also drain the remaining water in the fresh water tank, there is a valve in the wet bay for this.
I open the low point drains that are in the same compartment as my water pump.
In your case since you've already put the pink stuff into the system you should go ahead and complete using it.
Did you drain the water tank. Behind the water tank you MAY have a bypass valve that is used when winterizing, this isolates the water heater tank so you don't put the pink stuff in it.
There may be a valve system to put the pink stuff into your water lines. You need to make sure you got the pink stuff through all the lines all the way to the faucets. Any water left in the pipes could freeze.
If you live in a really cold area the pink stuff is the way to go.