Its more likely that the rear springs are just sagging due to fatigue and/or extra weight. Pretty common particularly if you have a few years on your van. It would help folks contribute if you list the year and make. My guess would be you're more likely in for a new set of year springs or spring helper of some sort.
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2015 Chevy Express 3500 Duramax
w/ Quigley 4x4 & Agile Fox shocks
Sold 2005 E350 Chateau
Quigley with Agile RIP, 6.0 PSD
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