I joined the broken spring club. Towed about 350 miles, just got off a 70 mph highway and was pulling into our campground. Hit some nasty potholes at about 20 mph, heard some clanging and saw smoke. Thought I blew out a tire, turns out I broke the spring. Thankfully we were 300 years from our site. Got it into the site, got it leveled by parking half off the site.
Found a local shop that had a spring, bought 2 of them at $94/a piece (ouch), but they were in stock and we were continuing on to Vermont 2 days later.
Got the broken one changed in the campground, inspected the rest. I'll order 2 more springs and change out the other 3 when I get home. Upgraded from 2200 lbs 4 leaf springs to 3000 lbs 5 leaf.