I'm old school when it comes to off road stuff and have always preferred leaves to coils, mainly for the simplicity of not having links to bend. You can also weld leaves together on the trail if need be. I had a set of Alcan springs on my stretched FJ40 that flexed like crazy and used the "open" style spring locating clamp which lete them move around as needed. I think that ORD uses a pinch clamp? Dunno, maybe that's what causes the bind. Before getting the Alcans, I bent up the pinch clamps and drilled them for keeper bolts on my stock springs. That worked pretty good too except the stock springs cracked from all the SOA flex (see welding comment above
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Anyway, please document your Suburban "journey". I'm heading that direction with the '89 I just brought home.