The Adventures of Sylvester, the 2018 Suburban 3500 HD

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Geotrash

Dave
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This past summer (July 2024), I was lucky enough to get my hands on a 2018 Chevy Suburban 3500 HD. I spent about 2.5 years steadily watching the market for the rarest of these mythical unicorns - one with the LT trim package. Internet rumor holds that only 200 of these trucks were made for the '18 model year, and only a handful of those were LT's. They would come up for sale maybe once or twice a year, but they were usually 2016 model year, higher mileage, and a little dog-eared from 4-7 years of fleet duty.

Finally, "the one" hit the market on eBay Motors this July, and it was a beauty. Only 18K miles, and kept in a climate-controlled garage, just 3 hours from my front door, in Maryland. The guy who bought it new, owned a fleet of trucks, so he was able to pull some strings and get ahold of this one from a dealer in Maine in 2018. I paid $65K for it, which is high, but I plan to keep it for many, many years. It will only see limited towing duty pulling our camper, and will be garage-kept when not being driven. With any luck, it will be the last tow vehicle I ever buy.

I'll use this thread to document any changes or upgrades I make to it, as well as document some of our adventures with it, along the way. The only things I've done to is so far is a Blackbear tune, which was a good decision, and aftermarket crossbars for the roof rack. And the only immediate plans I have for it it to add a transmission dipstick. I have the parts but probably won't get to it until the spring. It's wearing its original tires, but they are flawless, with zero dry rot, flat-spotting, or other signs of age, so I plan to run them for another camping season, next summer.

Long term plans include new tires, of course, along with black wheels, but apart from that, it's a blank canvas. I welcome any ideas and feedback others may have for investments to make in it.

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Geotrash

Geotrash

Dave
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Adding some pics from our adventures with it so far. Towing with it feels effortless in terms of stability, braking, and power with the 4.10 gears. It's more stable than our 2012 Yukon XL Denali (3.42 gears) and spends most of its time on the highway in 5th when towing instead of 4th, with less downshifting needed. Engine and transmission temps are cooler as well, with all factory components. I'd made considerable mods to our 2012, including a cam, thicker radiator and upgraded fans from the K5L package, and a bigger Derale 13960 transmission cooler, but the big burb trans stays 30ºF cooler than our 2012, also likely due to the 4.10 gears. The coolant temp gauge has never moved above the center peg, either.

Lots of folks on the interwebz comment on the factory rated towing capacity on these being only 3,000 lbs., but from an engineering perspective it's actually more capable than the GMT900 2500's were, with bigger brakes, rear axle shafts and springs from the 3500 SRW pickups. But you gotta remember that these were built primarily for armoring, so GM just never bothered with the J2807 towing test for it. It doesn't mean that it can't safely tow MUCH more than that. And as long as you're within the GAWR, GVWR and hitch ratings, they won't even bat an eyelash if you ever get flagged into a weigh station anyway.

I stopped at a weigh station before heading into the tunnel under Chesapeake Bay for the routine propane bottle inspection and I chatted with the guy there about it. He confirmed that they don't care about rated towing capacity and would only look at the GAWR and GVWR placards, and only if they had obvious safety concerns or I was operating as a commercial vehicle. If I'm within that, I'm good, but RV's don't have to worry about stopping at weigh stations in most states anyway unless there are signs that specifically say so.

Misty Mountain Camp near Charlottesville:
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Drove it to the Earl Scruggs Music Festival in southwestern NC in August and caught Marty Stuart and Jerry Douglas live, among many others we love:
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Did some boondocking with friends out on the James River near Scottville, VA:
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Another trip out to Deltaville, VA:
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And finally, a weekend birthday getaway to Elkton, VA:
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