I had so much fun launching cars into the stratosphere with this glitch in freeroam back in the day 
Here's another clip, car deformation physics go BRRR
The last Rockstar game I played before this was RDR2 and GTAIV makes an interesting contrast. "Guys, what if drugs? What if sex? What if gay? What if penis? What if woman had penis? What if domestic abuse? What if fat people?" EPIC SATIRE 2008 STYLE
also the war on terror I guess
I've played a lot of GTAV in the intervening years and GTAIV feels a lot more crass and mean than even that game. I just had a radio ad for mobility scooters, and you can probably guess what angle that took. Basically "abuse medicare to get a mobility scooter and force the American taxpayer to subsidise you being a disgusting fat slob" EPIC SATIRE
I'm 95% certain GTAVI's writing will be much better overall and that gamers will piss and moan that it's gone soft and woke
I would just do the swing set glitch for hours while watching Netflix. I love that you got that working for you. I’ll have to put in the work to do that again.
You just need to install GTAIV Complete Edition and install Fusion Fix on top of that so it's pretty simple (though I also used a mod that restores all the songs that have been cut from the game over the years)