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Not so; it was the other way around: early trucks all had roller bearings there... (Until someone realized this was/is a design flaw...) These roller bearings just aren't built for a low amplitude oscillating motion. The lubricant doesn't get pushed around enough and micro-fretting between...

Usually those bolts are rusted in place and won't budge with common tools - unless you had a torch and heat the area to almost red.

You may have noticed already that the housing is slotted both sides, so that when you tighten those bolts it actually clamps both lower spring leaves, thus eliminating any possible lateral play, there. So yes, ideally those two bolts should be loosened before removing the spring pack - although...