I always do a double check of my toad whenever first start out in the morning, and also when we stop for gas. However, there is one additional check I always perform when we get underway. I call it a "coast test"
As I step on the gas and start to pull forward, I'll put the transmission in "N" and see how well the MH seems to be coasting. If it doesn't seem right, I'll check the MH parking brake or Toad brake, or toad in gear.
To date, I've caught the MH parking brake not fully disengaged a couple times.