Hi guys, newbie here. Just recently got my first pickup-based SUV. And what i really noticed is matagtag siya lalo na pag-empty load. I've tried lowering tire pressure, putting sandbags at the back, etc. and they work fine naman. I'm just looking for a more permanent solution.

I want to upgrade my suspension focused on comfort (since i don't go off-roading). I'm using a 2015 Chevy Trailblazer, and leaf spring yung rear suspension niya. My questions are:

1) Anong magandang spring+shock combo that is built specifically to improve ride comfort?

- sa shocks i've been reading bilstein 5100, procomp es1000, koni fsd, etc.
- sa springs, i have no idea
- i also read something about investing in an air suspension/leveling kit

2) Where can I get professional advice (kung meron man) regarding this upgrade?

Thanks in advance sa tulong niyo guys. Medyo overwhelming kapag newbie pa.