How long should a car ramp be?

Roadandtrack.com's car-ramp roundup highlighted 71-inch ramps as the longest commonly available, producing the gentlest incline for SUVs and trucks. Shorter (around 63-inch) ramps are easier to store but create a steeper angle that arthritic or anxious dogs may refuse. Reddit threads we read in r/dogs and r/Rottweiler echo that incline angle matters more than ramp length per se.