Try something old fashioned - a basting frame. You sew the layers rather than pin them but it really doesn't take any more time & you can still machine quilt. You'll needs some narrow smooth boards that are slightly longer than the largest quilt you anticipate ever making, 4 - 6 C-Clamps, and a pair of saw horses. Raid the toolchest for a heavy duty stapler. Staple a strip of medium weight fabric (pillow ticking is traditional) to the boards (about 3 inches should extend over the edge of the board). Adjust the sawhorses to slightly higher than waist level and clamp them on. Pin your backing fabric to the board fabric and adjust the saw horses till it is taut. Then lay the other boards across the boards on the saw horses so the backing overlays the fabric on those boards just enough to pin to it. Make sure everything is smooth & tight, then add your batting, pinning to the sides and your quilt top the same way. Now you are ready to start basting. Take any thread you want to use up and a package of needles. Sew fairly straight lines across & up as far as you can reach. They should be about 4 - 6 inches apart. When you can't reach any farther, unclamp the board you've been working at, remove the pins along the side and roll the quilt under the board till you get to where you left off. If you have help, someone can be working from the other end towards you. Your lines don't have to match. When you're done, unroll andd remove the rest of the pins. This does take some room but can be done in the garage (careful you don't drag the quilt in oil spills!) or outside on a nice day. If you are worried about tangling the basting thread in your machine while you are quilting - just snip them as you get to them as you would remove pins.