In GTA Online, there is a way to edit my character to my liking, and the character is saved and is your same one every time. Can this be done in the modded version?

I have added two cars to GTA V. They work. it doesn't matter what they are, as long as there are only two of them. I have 8-10 cars that I would like to add as as long as I only add two at any time, I can use any of them. I understand there is a limit to DLC add-on cars that will work, but surely it's more than two...?
I am wondering if the issue might be that I am using both the MenyooSP mod and the TrainerV mod at the same time. That all seems to work. I can pull up the menu for each one in game and it all seems to work. But if I add any more than two cars, it CtD every time.
How can I add more than two cars?

I'm new to modded G5A V. I got a modded version setup up and got it to work with a simple one... the "Menyoo" mod. It all works good except the cats. I try to spawn a new car mod, the car appears for 3-4 seconds then disappears. All other parts of the mod appear to work; the modded characters, the weapons, the abilities. But the cars all disappear after a few seconds.
What am I doing wrong?