I have a 55 gallon just like you and this is how I do it. I prep my RODI water outside in the garden, unit hooked up to a garden hose, portable, and I fill a 32 gallon trash can.
Now I go to my tank, clean it, use a 30 foot eheim 16/22 tube and do the good old suck and syphon water trick. Water goes out the window into the garden. When I'm done cleaning, I wheel the trash can full of remineralized RODI water close to my tank, still outside the house. Put an eheim 1280(? not sure which one but pretty strong) pump into the trash can, connected to a 25 foot tubing, run the tubing to the tank through a window, run the extension cord next to my tank and plug it in. The tank fills up within 2-4 minutes.
This sounds like a lot of work but I can change the water in 15-20 minutes if I don't clean the tank and prune the plants. If you don't use rodi water, just get a big bucket/trash can and fill it with regular tap water through a hose outside...or smaller bucket with a smaller pump indoors. I also added a little ball valve to both tubings to regulate water flow.