I had the dealer mount one of those BIG bubble levels on the pin box when I bought it.. Easy to see from the driver seat, my DW manages the leveling boards. I carry a 2' level in the side compartment where the jack controls are. I sit it on the inner lip of the door frame, front to back. It's right there when I'm lowering the jacks.
Of course if I ever figure out this Intellijack system again I will only have to worry about side to side.
Clif and Millie
Ozzie (half a dog tall & 2 dogs long)
2009 Ford Lariat F350 SRW CC Diesel
2013 Cruiser CF305SK Patriot Edition