Hi there.
Feel your pain on this one- we have a rear-fold Trackabout- the annexe of which is huge...... and try as we could, we could never get it not to sag somewhere........ so if it rained, we were needing to call in dam-busters!
Our solution was spreader bars, and like you, we found that getting double-ended C-clip spreaders was nigh on impossible- certainly all the standard camping places didn't stock. We discovered that they are all stocked by one of 2 big players anyway.
What we did discover was this mob based in Goulburn, who were so helpful- and have everything you could possibly need in the way of spreaders, tent-poles etc- and they really knew their stuff.
www.supex.com.auNo affiliation, but we appreciated their excellent service, so more than happy to recommend them........ and now our massive annexe is as taut as!!
