Just wanted to mention that if you have back problems, I would suggest you look into zippered leaders. You can sit to put zippers on or off so you only spend a few minutes zipping on or off the table. Also, you use safety pins - much less chance of poking yourself(I don't think I ever have) as with the large pins. I think some people baste the quilt to the half zipper but I was taught to use safety pins which is easier in my opinion. It is a one time investment and a one-time job of sewing half the zippers onto the table leaders. Here's a link to them on Amazon:
https://www.amazon.com/Zipperstop-Wh.../dp/B005774J2G You may have to look around for the right size for your table. Google them and you will also find you tube videos. I have found here on the board there hasn't been too much enthusiasm for them but I have used them for years and wouldn't do it any other way.
Concerning your space problem - do you have a closet in the room? I saw one person who removed the sliding doors from the closet creating an alcove to the room which allowed additional space for the long arm.
And remember, you don't have to stand at the machine for hours on end. Take frequent breaks and then return to the quilting.