I have done a lot of SID quilting with my Pfaff 1471. It is a mid 1980's machine with a built-in walking foot.
The largest quilt I pushed through this machine was about 82 x 63 inches - and had warm and natural batting in it.
I pin baste closely -
Only stitch in one direction - so that if it is going to pull - all the pulls will go in the same direction
Use rubber gloves for "traction" while handling the quilt
I use more of a "puddling" than "rolling up the quit" to get it through the machine
When sewing "on the bias" - I very carefully straightened out each area while I was sewing it
Occasionally I had to do a small jog to stay in the ditch if one of my joins was off a bit - not a big deal
I like to SID - probably because I have not figured out how to do FMQing!