I agree w/ scouting your route and renting an appliance dolly. Also, the rachet tie-downs are a good idea. Leave the door on. The handle makes a good securing point for the tie downs. If you've got access to a trailer, that'd be even better--take the gate off, tip the safe over, and just slide it in and tie it down. (You'd be amazed at how light 650lb is, when the trailer takes the weight as the safe tips over on it's back. The 'mid-point' of equilibrium is so perfect that it didn't even slam when I got it all the way on it's back.)
My safe weighs 650lb, and I moved it by myself from one home to another. Nothing to it if you use your head. I was amazed. I'm no giant--5'8", 175lb, 50+yr old; I never lifted a dumbbell in my life, and that safe moved as easily as my washer and dryer. The key was the appliance dolly--it allowed great leverage against something short and squat (with its' center of gravity somewhere near your belly or chest height), and with its' large wheels, there was no need for any sheet plywood or metal runners.
Now the big safe--the one weighing 850lb--I made a big mistake letting the gun store load it into the back of my truck. (I had to get it down and off it's pallet.) I shoulda used the trailer again, but hell, it was two years later and I wasn't thinking. Glad my wife was there to help. Again, she's no "Russian Olympian"-- just her being there shows that if you and your partner use your heads, leverage is all you need.