Hi rockyemt274,
Congratulations on your Prowler and welcome to the Heartland Owners Forum. There's lots of useful information here along with a great bunch of friendly and helpful people.
Not every trailer comes standard with a DC/Battery cutoff switch. High-end 5th wheels do, but I'm not sure whether Prowlers have one. If you have one, it's typically near the battery and can probably be found by following the cables attached to the battery terminals. If you don't have one, they're probably available at most dealer parts departments and should be easy to install.
If no one from the factory chimes in in the next day or two, you might want to call Heartland Customer Service at 877-262-8032 / 574-262-8030. Have your VIN # ready.