Yeah, a good alignment is critical. The Saf-T-Plus can also cause it to pull to one side if it isn't centered properly. I had to adjust my Saf-T-Plus about 4 times before I got it perfect.
On my class C I got an alignment, installed bigger front and rear swaybars (Hellwig), and installed a Saf-T-Plus, and it drives significantly better now. I'll probably also install Bilstein HD shocks at some point.
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