@yankeejune as most cases, some mods are simply not compatible with the latest GTA V version. A general rule of thumb is to look at the date it was last updated (however this doesn't always mean it will be non-compatible). Some mod creators will tell you in the description if it is working with the current GTA V update, as well. As most people would say when modding GTA V, always check if your gameconfig/scripthook/nativeui is up to date. Since you want to play LSPDFR as well, you need the RageHook plugin. RageHook isn't that stable though, so be careful.

I'm back, again. Having an issue with one car in a combined DLC. Copied and pasted everything required into the .meta files. Car is RHD, however it's the only car I've had trouble with consistently (the car is the RX7 FD3S by [YCA]Vsoreny). I have been digging through everything and the only thing i can think of is that in the vehiclelayouts.meta, there's two sets of entries for "SEAT_RHD_FRONT_X". They are slightly different, one referencing "Standard," and the other referencing "Low," for the animations. Not sure what to do at this point, been trouble shooting this for about a week now.

I've been compiling a bunch of cars into a personal all-in-one DLC pack, and I was just wondering, how would I go about changing a [vehicle]_mods.rpf file's name, and have it work? I've been testing out a car that I intend to do this with and had no luck with it. I'm assuming it's got something to do with the modkit IDs in the carcols.meta, but I've not gotten it to work just yet. Any possible solutions or tips?

That's a modkit ID issue. If you're fine with modifying the carcols.meta and carvariations.meta files, then you'll need to change the numbers in <kitName> and the same number under it in the <id value=xxx> tag.
For example in carcols.meta: <kitName>1186_ae86_modkit</kitName> and <id value="1186"> need to be changed, so I would change both to -let's say 999- : <kitName>999_ae86_modkit</kitName>, and <id value="999">.

As for carvariations.meta, you can find the modkit under the exact same name, and change that according to what you've changed in carcols.meta.

I've been trying to get my own combined DLC running (up until now it was perfectly fine), and i was trying to combine around 5 rims mods into one RPF to save on time for editing metas. After adding the YDRs to the rpf file,and adding all the stuff under <Wheels> in the carcols.meta file, my game refuses to start, even (presumably) after undoing everything I have done with the aforementioned mods. It doesn't give me an error or anything at all, just closes out and gives me the Social Club, "the game exited unexpectedly". Have dug through the log (most of which I don't understand so there may be something else that's causing this), and I noticed that the loader just stops loading after a certain point. Might be the game itself closing, so it doesn't finish the process, or something else, again, I don't know. Please help if you can, thank you.

I tried installing some clothing mods for Franklin (and I have checked that the mods are for Franklin). Nothing I try (like uninstalling and reinstalling, or replacing the textures again and again) works. The model does show up in OpenIV but doesn't load in game.

I recently installed a clothing mod(s) (Specifically the recent Bape x Adidas Puffer Jacket, and 4ng4h's hoodie mod). I have replaced the right files, and it shows perfectly fine in OpenIV. I have the most recent version of GTA 5 AND OpenIV. The model shows up all rendered and fine, but in the game itself, it just loads the texture on the original model. Unfortunately I cannot upload any logs, because pastebin will not let me. I have tried reinstalling OpenIV and redownloading and installing the clothing mods. How can I fix this?