Very Quick
"* It's big, easy to see in your mirror, simple to install and adjust.""Be careful that you don't tighten the two screws too much because there is little support underneath the screw holes and you will permanently bow the black plastic base, throwing off the front-to-back accuracy."
"Then setting the front back level is just as easy buy watching the smaller level from the outside and using the front jacks."
"* This product worked well at first but dried out and became useless within 2 weeks."
Camco 25505 EZ Level (Click to Compare Deals)
Quick
"Be careful that you don't tighten the two screws too much because there is little support underneath the screw holes and you will permanently bow the black plastic base, throwing off the front-to-back accuracy... After less than two months exposure to the sun, the green dye has faded entirely so that the liquid is completely clear... The convenience of having this attached to the trailer tongue instead of carrying around a separate level outweighs the cons, although I might look for a higher quality version if I had to buy another.""* I used to use a small level on the floor or counter top of my RV to check for level prior to setting up because I really didn't want to place silly little levels on the outside of my 5th Wheel... Then setting the front back level is just as easy buy watching the smaller level from the outside and using the front jacks. Yes it is low tech for a world with 6 point leveling systems and such but when those systems don't work or you don't have them you need a reliable way to level your rig."