We use the PetStep ramp for our lab and toddlers. Folds easy and fits in the bed of my truck.

I just bought a Petstep Original Folding Pet Ramp through Amazon and it is fantastic! My dog is 12 years old and has arthritis. Can jump out of the car but struggled a lot to get in to my subaru outback. This is grippy enough for him, plenty wide, and very sturdy. Weight limit is apparently 500 lbs. A lot of Amazon reviews were from folks with dogs closer in size to yours and they loved it. I would STRONGLY recommend. It was a few bucks cheaper when I bought it, but I'd say it's still worth the price for sure. link to amazon