Sigh...well I have a Silverado 3500 and my Voltage is nice and level when hooked up towing. LOL!!!
A lot might be because I have a Highway Products bed, they installed the Reese 30K hitch. So I run Firestone air bags at 50 psi to get things level when towing.
Glad you have things running smooth... I hope when I hook mine back up it does to. I wonder if you didn't have those air bags how it would be? Any ideas....