Compare your rig with others on as many venues as possible. Decide what you will accept for the 5th and the truck. Add a few bucks for negotiating if you have time to mess with it.
Put it on Craigslist in your location and any major area with in a couple hundred miles.
Don't get scammed.
I sold a car once and the guy seemed so flakey that I was sure he was NOT legit. I told him to meet me at his bank so we could consummate the deal, He did and I got full price. Sometimes you never know.
Good luck on the sale and the DW health issues.
jesseannie