Ram 2500 6.4 gas Towing 5th wheel.

^^ "They've been making them since what, 2008?"

IIRC, the Ram rear coils came along about 2014, not that is really matters. I think ride improvement the reason. If they hindered the perceived use of a HD truck, I agree, they would not have continued using them.

The guy I frequently camp with has one. No issues, he loves it.

I'd think they'd have more of an impact on bumper towing than 5th wheel towing, if they had any impact at all.

They still produce the 2500 with coil springs right? They've been making them since what, 2008? That pretty much says it right there. If the coil springs were a problem, they would have stopped producing them long ago.

Any perceived "problems" with the coil springs were well-discussed BEFORE the trucks were available for purchase. Lots of fretting and hand-wringing over nothing.

From what I've seen, the rear suspension with coils is a non issue

I don't see a problem with the coil springs, but have no personal experience with them. I know they do tow FWs with them. It should not affect the stability of towing a FW, but depending on pin wt, you may want to add bags or Timbrens.

Rams have a bit shorter distance from rear axle center, to back of cab, with the shorter beds, so hitch selection is more important than the coil springs IMO.

Jerry