I have the same problems as you. Over the last few years I realized heavy amps are no problem if you think about it. I own a hand truck and carpet sliders with a little fulcrum to lift stuff up a couple inches. It is simple. Even boxing and unboxing 150 lb monsters. You look at the box, think about each movement required and you can remove it from the box or put it back easily. Rolling things gets into packaging… etc. all this is last resort. Remember you could easily move it in position and never again touch it.
1) Buy from a dealer and have him deliver and install. Your guy should be asking if you would like it installed, your not looking old enough… hunch over when you talk to him).
2) Give a big tip to the delivery guys (they usually love this and are happy to do it) and have them put the box in front of the position it is in.
3) Hire someone to install … or just carry it.
I would never compromise my audio system for an inconvenience. Once in place the are hundreds of hours of enjoyment in front of you.