What model 2002 Sunline do you have?
By chance, is this it? This is what we call a "jack knife sofa". It would look like this. It folds flat into a bed.
If this is what yours looks like, then this is how the cushions come off.
Partly fold the couch. Meaning like about 1/2 way down. Then look under the couch and on the ends you will see hex nuts. 2 nuts on each end of the bottom cushion. They take a 9/16" wrench if I recall right. By removing those 4 nuts, the entire bottom will come off and look like this.
To do the back cushion, it is held on the same way. Take the bottom off first, then reach up and take the nuts on the ends and it will come off.
Be careful of the spring loaded frame. It likes to pinch fingers if you are not watching. A helper holding the cushion while you are getting the nuts off helps as they can hold the spring system by holding the other cushion.
Hope this helps. If this is not your couch, try and post pictures so we know which one you are talking about. Sunline used a few coaches over the years pending which floor plan model you have.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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