I used to sell safes and have moved more than I care to remember. Its easiest with 2 people but can be managed by yourself if you have room to get around from one side to the other.
Get 3 pieces of 3/4" black pipe about 3' long. Tip safe back enough to roll 1 piece of pipe back about 1/2 the depth of the safe. Place 2nd piece so it's under safe about 1" when you set it down. Then let the safe down onto 2nd pipe. (Person in back needs to hold pressure against safe so it doesn't roll backwards.)
At this point, safe should be fully raised off floor, sitting on both pipes. Have helper push it toward you, drop 3rd pipe in front of safe so it rolls up on it just before first piece comes out the back. When the first piece clears the back of the safe, have your helper hand it to you. Repeat process until you have it where you want it.
To get it on a trailer, roll it to where you can back trailer up. Work all but 1 pipe out from under safe. Using that pipe as a pivot point, lean back and get a 4" pipe 1/2 way under it. Roll forward and add 2nd piece of 4". If you need it higher, repeat with 6" or 8". If your safe is smaller than about 40 gun, you can probably get away with PVC once you get larger than 4". Smaller doesn't have the wall thickness to support the weight.
If you're moving to/from the BCS area, I still have the pipes I've used for years. Let me know if you need to borrow them and/or if you need a hand.