Flat tires are not that infrequent, especially if you use your vehicle in new construction areas where nails or other sharp objects are present. I'm involved in the home building area, and my wife lives to visit areas where new homes are being built. We have both experienced numerous flat tires due to punctures, so to us easy access to the spare tire is a very important issue.
The last time I had to use a spare tire was about a month ago when one of my regular tires went flat.
It's probably unlikely to get a flat on a Ridgeline; they don't see to many construction sites, due to the fact that it is not a truck.
I have never seen a Ridgeline with anything in the back. They are basically novelty vehicles like the Explorer Sport Track, and are not designed for actually hauling anything. Still, even if all you have back there are groceries, the spare tire location is a very poor design feature.
I have had several trucks as secondary vehicles. I can afford an Escalade/Avalanche, but do not like the high sides and bed limitations. I dislike the Daytona truck with wing. Also fiberglass covers, caps and any 6 foot bed. Also small trucks. And the El Camino type car trucks, even if they have a 396 or 454 4 speed.
I have had a couple little trucks, including the Splash when it came out. Over time, my recommendation is a full size truck, even if just a 6 cylinder work truck with automatic, cruise control and air. 8 foot bed always with a new bed liner or Rhino Lined. I can turn the key and go anywhere at a moment's notice to pick up things. I also recommend a Class III hitch.
I bought a Knaack 117 wide box, but shallow so 8 foot material slides underneath. I have renovated my home, towed and buy a lot off CL. I actually use a car cover vs tarps, as it has elastic and ties down easier. Quite frankly, 99 percent of the time my SUV can handle everything. The advantage of the truck is soil, mulch, gravel etc can be carried, vs crap up a car interior. The tire design under the bed, tiny bed and frame stress is not a consideration. You will be paying insurance, so why not get a real truck? I tried small, and many times I could not move or buy things on the spur of the moment at great sale prices.
After many years of trial and error, I hope my comments are helpful.