Originally Posted by Alumineer
When you think you have the perfect alignment (but before you put your transmission in PARK and let off the brakes), engage the emergency brake. That will keep the TV from moving after you let off the foot brake. As a secondary benefit, many rear brake auto-adjusters are engaged by the emergency brake mechanism, so that you're actually helping the rear brakes stay in proper tune.
I used to do that keep it from moving. But, I thought I read somewhere that because I'm raising the truck so much to connect hitch and then the WD bars, that it wasn't a good idea to engage the parking brake.
If that's not accurate, I'd rather to reinstate the practice of engaging the parking brake. I'm usually in the habit of engaging it anytime I'm parked, regardless of whether it's a hill or flat. Just a habit I've always had.