I had one similar to this a few years ago. Loved it. Basically you cloud grill on either side or slow smoke by putting the turkey, ribs, whatever in the upper (large) side and keep adding wood to the lower (small) side. Usually about 12 hours to smoke a turkey 18 pounds or biggerThe Texan trailer BBQs probably meet with your style. Sure, the hot grill but a smoker on the side. Gives you the best of both styles of cooking.
Over here I noticed some amazing BBQs started appearing in local DIY stores. Very expensive ones with grill and smoker. There's also gas BBQs with gas rings on the side for pots I guess. The UK is catching up I think.