Easiest way to carry the tank especially down those stairs and nightmare of a driveway is to use nylon straps. When I moved my 3/4" thick glass 230 gallon tank into my place I used 4" nylon truck tie down straps. Measure them to the right height so when you are standing straight up the tank will be 6" off the ground, and tie a "handle" in the strap. Place 2 straps under the tank and away you go. I trust this strap method way more than suction cups or fingers.
Also when I transported the above tank from south of Eugene Oregon to my house I placed a 2" thick piece of foam in my truck bed to place the tank on. The foam is harder, kind of like styrofoam, so it gives a really stable yet somewhat pliable base for your tank to ride on. I drove 400 miles with my tank and it rode beautifully. I think I placed a piece of plywood on top of the tank to put straps over to to spread out the strapping tension.