Sure thing!

My girl is a Doberman, so 70lbs and also has that deep chest/tiny waist issue that makes a lot of gear fit oddly. I also drive a Chevy Spark, so tiny economy compact car - my SD rides in the backseat.

I've had a few other odd harnesses that were advertised as seatbelts that had mostly negative success before I moved on to these.

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Kurgo (was probably the predecessor to the Tru-Fit, this was 2014 or so)Pros - Cheap, easy to get ahold of from any pet store, attached to the seatbelt and more or less kept her in place.Cons - the straps were thin and dug in a lot, was a complete pain as far as her gear went (could have seatbelt OR vest, but not both on the dog)

Sleepypod (Utility)

Pros - very secure, attached to carseat buckles so it couldn't tighten up if she was fidgety, fit decently under a smaller style vest but not under a large one

Cons - it's covered in metal buckles that not only touched skin on the dog, but the snap-clasps would often catch her skin or the corners would dig in to her skin. I'm in NC, so it gets *very hot* here with high sun, she became very irate with this harness because it kept irritating her. It also would come loose without the vest holding it down.

Sleepypod (Sport)

Pros - No metal buckles like the utility, fit to the seatbelt instead of the carseat buckle so it was easier to snap in.

Cons - this was the worst harness I tried and their customer service was awful when I tried to return it and chewed me out. As long as the dog wasn't y'know...in a car, it was fine. The moment you tried to use it it was a problem.

It could not fit under a vest and be useful, I had to remove her vests to strap her in.In the one day I had this harness I had to pull over on multiple separate occasions on my 15 minute ride to and work because even after careful fitting it would come loose and twist. I would look in the mirror to see my dog held to the seat by her neck. I was alerted to it the first time because my dog was wheezing with the way it had gotten loose and twisted. I decided this was a severe safety issue and returned it.

On calling Sleepypod to get their advice/return they advised me that it ONLY worked if the dog remained in an upright seated position facing forward. No lying down, no moving, no leaning with turns. Despite having pictures of it "working" with a lying down doberman on their site.

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Ruffwear (Load Up)

This is my preferred seatbelt and the only one I'm really comfortable recommending. I use this underneath a Ruffwear Singletrak day pack I've customized along with the Brush Guard so that the Singletrak's straps don't dig in much.

Pros - fits fantastic under any size vest I've had as the loop for attaching to the seatbelt is very far back on it. Fits great on a deep chested dog and no pinch points (the straps for it have a thick protective layer between the buckles and the dog skin. I can leave it on her all day with little to no issue while doing errands or going to work. Honestly it's simple, it doesn't do any harm to her, and it's been the easiest one to work with.

Cons - It can be a bitch to get fitted correctly and you can end up with a lot of extra strap that you'll have to roll up or tuck away. It is thick on both the top and bottom and may need some extra cleaning care since it's a lot more fabric than the other options and can just absorb smells.

On long-shaped dogs it might not fit as easily/well or they might get out of it. My mom got three for a cross country travel, her two dobermans did fine like mine, the long-girl got out repeatedly by trying to roll on her back.

[ Edit: Thank you to u/Alldoggosgood and u/ArborGal for pointing this out, the current model of LoadUp is currently OOS/recalled due to a safety issue with the buckle's side snaps. Mine is the older 2020 model that had the slider buckles - posted on my Twitter b/c apparently me nor my friends know what to call this style of buckle ]

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For any that make use of the car's seatbelt, I suggest picking up something like these childproof belt buckle covers. My SD (accidentally or not) will step on the release buckle on the regular without it. They're a little awkward at first but you get used to them.