Hmm... Looks like a natural gas Weber grill I used to use. You can be successful with slow-smoking your ribs, but you have to set up your grill differently. If you have the 3-burner control model, only light the front ones and place your ribs at the back; i.e., need to have an offset heat source, much like a steel smoker has the wood or charcoal in a separate fire box on one side and the meats on the other. The smoke is then channeled to drift from the firebox, where the soaked chunks/chips are placed on the coals. It travels from the firebox and up under the meat, which is placed on racks over drip pans or water pans.
A good and not expensive setup for ribs is the Weber 44-inch that allows water-smoking.
I use a New Braunfels, TX Black Diamond to smoke the racks of ribs until they turn a mahogany color from the mesquite/oak/hickory/apple/pecan smoke, then take them off and put them in a roasting pan with a little bourbon in the bottom, then tightly cover them with foil. Let sit in a 250-degree F oven for about 5 hours, and you'll have fall-off-the-bone ribs. This last step restores the moisture to the meat. (I have NOT had good luck with moist meat using the water pan setup under the meat in the smoker, so I use this, and they taste nice and smokey, and tender.)
Your setup looks more suited for grilling from what I see, but you may have a method with which you've had good success. I had good success using my Weber, making a few smoked turkeys for New Years Eve and Thanksgiving. You have to be patient - slooooowwww is best, like pipe smoking.
Anyway, there's my 2 cents... I did lots of research and got tips from people all throughout Oklahoma, Texas, North Carolina and took some elements of each person's "how-tos" on making rubs, mops, sauces, and modified them to make my own. That was part of the fun. One of them even had a suggestion for a modification of the Black Diamond that improved the funneling of the smoke to travel under the racks of ribs.
Like the tips we all get here, great and fun stuff!