I am one that prefers more of a soft suspension feel when driving similar to that of GTAIV. I use these mods together which comes pretty close to replicating the feel of GTAIV...
Natural Vehicle Dynamics Realistic Handling (Adjusted) 1.0 : https://www.gta5-mods.com/vehicles/natural-vehicle-dynamics-realistic-handling-adjusted
True Realistic Driving V (Realistic Mass, Handling) V5.5 : https://www.gta5-mods.com/scripts/true-realistic-driving-v-realistic-mass-v0-1-beta
Manual Transmission 5.1.1: https://www.gta5-mods.com/scripts/manual-transmission-ikt
Only problem is that sometimes the cars will spin out when too much gas is applied. I'm sure there's a setting within the mods that I forgot to tweak so its likely user error.
Might need to manually adjust a few of the police handling lines per this forum to prevent your SUV's from flipping over as they are a little top heavy with this mod combination.