Similar situation here - I was literally in the same boat last week! I just picked up my GX and was so paranoid about those rocker panels. Basically, I spent hours digging into the technical specs because I didn't wanna drill into a 70k truck, you know?

I ended up going with a setup that I'm super happy with. Here is how I figured it out:

1. Technical Fit: The Lexus OEM Mud Guards PK389-60100 are actually designed for the standard body, but the Overtrail has those slightly wider flares. I noticed they leave a tiny gap where gravel can still sneak through if you're running the beefier A/T tires.
2. No-Drill Tech: I looked into the WeatherTech MudFlaps 110156-120156 because they use a patented quick-release locking system. It's cool cuz it uses the existing factory holes and a little tension bolt. No drilling at all, which was a huge relief for me!!
3. Coverage Specs: Since the Overtrail uses Lexus GX 550 Overtrail 18-inch Alloy Wheels with those 33-inch tires, you really need something that extends about an inch past the fender lip. The RockBlokz Mud Flaps for 2024+ Lexus GX550 are actually adjustable, so you can slide them out for more poke.

I went with the RockBlokz and honestly, it works well. It was a bit of a puzzle to align them perfectly, but they feel sooo solid. Plus, no drilling! Just sharing my experience cuz I was stressed about the same thing... peace

+1 to what was said earlier. The OEM ones are pretty useless for real protection. But seriously, be careful with those "no-drill" clips. I unfortunately had issues with some cheaper ones that just snapped off at highway speeds. It’s literally a safety hazard for cars behind you if they fly off! I mean, stick with brands that use the factory bolt locations so you dont lose a flap or damage your fender liner... gl!

> I’ve been scouring the web for the best mud guard options, but I’m torn. I looked at the official Lexus OEM parts, but they seem a little small—I’m worried they won’t provide enough coverage for the wider tires on the Overtrail trim.

yo, congrats on the new GX! honestly I feel u on those rock chips... the paint on the 550 is way too pretty to get trashed so fast. i'm still kinda new to the whole off-roading scene, but i've been doing a ton of research for my own rig cuz i hate the idea of drilling into a brand-new $70k+ truck lol. i mean, who wants to take a drill to those factory fenders??

for your situation, i actually think the Lexus GX 550 Genuine OEM Mud Guards PT413-60240 are better than people give them credit for, but they are definitely on the smaller side if you're planning on bigger tires later. if you want that "no-drill" rugged vibe, you gotta look at the WeatherTech MudFlaps for 2025 Lexus GX 550. they use a laser-measured fit and a "quick-turn" fastening system so there's zero drilling involved. it literally just clamps on. plus, they're usually wider than the Lexus ones, which helps with those wider Overtrail tires.

another solid choice i've seen guys talk about is the RokBlokz Mud Flaps for Lexus GX 550. they're super flexible so they wont snap if you hit a rock, though i think the install is a tiny bit more involved than the WeatherTechs. honestly, the WeatherTechs are probably the sweet spot for protection vs ease of install. anyway, definitely get something on there soon cuz gravel is literally the enemy of that lower trim!! gl with the new ride! 👍

Regarding what #2 said about "Similar situation here

• I was literally in..." that same mindset initially, but unfortunately, my experience with these newer no-drill kits has been pretty disappointing. Most of them dont actually have the structural rigidity needed for high-speed buffeting. The mounting points rely on friction clips that eventually shift, which leads to the plastic vibrating against the clear coat and rubbing it raw. It basically causes the exact damage you are trying to prevent. Honestly reminds me of a road trip I took down to the Ozarks last summer. I had just finished applying Turtle Wax Hybrid Solutions Ceramic Spray Coating to the whole body. I was so paranoid about the finish that I made everyone take their shoes off before getting back in the car. Then a massive hailstorm rolled in while we were stuck in traffic near Springfield. I just sat there listening to the dents happen... nothing you can do. Ended up spending three days at a local diner just waiting for the insurance adjuster to call back instead of actually seeing the sights. anyway lol sorry kinda went off topic there.

Re: "Regarding what #2 said about 'Similar situation hereI...'" - yeah, I'm right there with you and it’s honestly been such a bummer. I’ve owned every generation of the GX and I was so ready to love this 550, but seeing those first few chips on the paint literally broke my heart. Unfortunately, I haven't found a single thing yet that doesn't feel like a compromise, kinda frustrating tbh. I'm struggling with the same decision and havent pulled the trigger on anything yet because nothing seems perfect. I vaguely remember seeing a guy on YouTube doing a full walkthrough of some new options for the Overtrail trim last night... you should probably just search for 2025 GX 550 mud guard comparison on there. It looked like the first or second result. Honestly, just checking the main manufacturer sites or maybe a quick Reddit search is probably your best bet right now since everything is changing so fast for this model...

Not to disagree, but I'd actually suggest a different approach if you're looking for maximum protection without breaking the bank on fancy custom flaps. I've spent way too much time looking at the specs for the Overtrail and honestly, the OEM ones are way too slim for those 33-inch tires. Instead of the high-end boutique brands, have you looked at Husky Liners FormFit Mud Guards for 2024-2025 Lexus GX550?

I mean, *literally* every dollar counts when you just dropped $70k+, right? The Husky ones are usually way cheaper than the custom boutique brands and basically offer the same 'no-drill' install using existing factory holes. Another budget-friendly move is the WeatherTech No-Drill MudFlaps for 2025 Lexus GX 550. They're super rigid and have a great technical fit that follows the wheel well contour perfectly. I guess the big brands just have better economies of scale?? Plus, they look super integrated, not like some floppy universal flap. Just my two cents... definitely save that cash for some recovery gear instead! lol

Building on the earlier suggestion about using factory bolt locations, I agree that you should be very cautious about the mounting hardware. You dont want something vibrating loose on a trail or highway. Since this model is so new, the fitment data is still being updated by most companies and some might not be as no-drill as they claim. I would suggest doing a bit more research on your own to see them in action before committing:

• There is a comprehensive comparison video on YouTube if you search for 2025 GX550 mud flap shootout. It shows the coverage on the Overtrail specifically and you can see how far they stick out.
• Check the specific GX subreddits or enthusiast groups for the latest photos. Owners are posting daily now and its the best way to see the real-world clearance with those wider tires.
• I would also look at the manufacturer websites directly to download their installation manuals. It will tell you exactly if it is truly no-drill or if they are stretching the truth about the setup. I saw a really detailed breakdown of the different brands just the other day on a blog, so the info is definitely out there if you just spend a few minutes looking for it.