I really like this ramp! I have a St. Bernard who has trouble getting into the back of my 4Runner at times. This ramp is great for her. If I could change anything, I'd make it a bit wider. My dog is 150 lbs and while I can see this being great for smaller dogs, extra large breeds are wider dogs so... Overall though, the width isn't that big a deal. I think, at this point, my dog just isn't all that used to using a ramp and the fact that she can see over the edges makes it a bit scary for her.
I originally purchased the smaller ramp at my local pet store, but I like the larger one MUCH better - especially since I think my next car will be a Tahoe or something similar. Big dogs need big cars! The thing that I thought was so interesting in comparing the 2 ramps, the longer one is exactly as wide as the smaller one. So, if you're thinking of getting the Deluxe XL ramp for a bigger dog, there really isn't a point. The XL ramp is just longer. The regular ramp is fine for smaller trucks.
One other point, ordering off of Amazon was MUCH cheaper than the ramp I purchased at my local pet super-store. That one was much more expensive and returned as soon as I had a chance to see the two ramps next to one another.