I've got a 2016 GMC 3500 with an 8-ft bed, dually.  Looking to pick up an obnoxiously cool truck bed/slide in camper setup for just wifey and myself.

Any recommendations on manufacturers would be greatly appreciated!

https://bigfootrv.com/rvs#10-6

Check out Big Foot Rv Truck Campers

My buddy got a Northern Lite. Not cheap but well built and a lot of features

Arctic Fox or nothing. They are the best for cold and hot climate extremes. Extremely well built. And for a slide in, make an awesome unit.

That's the second time I heard about arctic fox. Thank you for the tip

I had a Lance 1135 camper once. Loved the camper, but short story is I sold it, and the people didn't seal the roof, and the wood frame rotted. Just saying that to maybe look for a camper with a minimal amount of wood in the frame. Mine was an 11 1/2" not including the overhead cab part. If I was buying another one I would look at the Arctic Fox.
Whatever you get, make sure it is rated for being able to be used off the truck without any extra bracing under the camper. I could have the Lance off the truck, leveled and hooked up in 15-20 minutes by myself. A slide would make a huge difference in an overhead camper also. I miss mine, but can't afford another right now, but one of these days I will have another one.
You will also want to get a class 5 hitch installed if you get a long camper and want to pull a trailer with it.

There is always HOST campers.

https://www.hostcampers.com/yukon/



TYPETriple Slide-Out, Side Entry
BASE WEIGHT3955 lbs.
WIDTH96″
EXTERIOR HEIGHT113″ – 118″ w/air
INTERIOR HEIGHT78″
FLOOR LENGTH136″
OVERALL LENGTH19′ 3″

FRESH WATER65 Gallons

GREY WATER51 Gallons

BLACK WATER32 Gallons

LPG CAPACITY15 Gallons

FURNACE25,000 BTU

WATER HEATER6 Gallon Gas DSI

SEASON4 Season

Non slide, means not much room, but Northern Lite.

Slide, Arctic Fox, not sure you can find one outside of OR, WA, ID, MT, maybe a few other nearby states. We have a 5th wheel one, nice and well built compared to many, and no issues so far.

This model looks nice

A buddy has a Northern Lite and it is a pretty solid camper.  And so far (2 seasons) no issues to speak of.