@Tekarovt Its all good man, it looks like I may have found my problem already. After playtesting for a couple of hours, I decided to take it a step further and install some of my car mods. I installed 8 cars, the Addon Car Spawner, the Gameconfig for Limitless Vehicles, the Packfile Limit Adjuster, and the Heap Adjuster. After about ~5-10 minutes of gameplay, I began experiencing the crashing issue again. From there, I removed all the car mods and just left the gameconfig/PFLA/Heap Adjuster mods in my game. After playing for a couple minutes, I crashed again. Next I removed the gameconfig and my game actually ran fine for more than an hour without any interruptions.
In conclusion, it looks like the Gameconfig for Limitless Vehicles mod doesn't work together with GTA V Redux. I had plenty of addon vehicles in the game before I added Redux, so I think it's safe to say that the incompatibility with eachother is what's causing it. Unfortunately, I need that gameconfig if I want to install and use any addon vehicles.
My new project is to compare the regular gameconfig with the modded one and see if I can tweak some of the values to get rid of the crashes. In the meantime, do you know of any quick gameconfig alternatives that may work with my game?