Which company can supply all-in -one camping service or products?

I doubt any would try. Camping enthusiasts tend not to like mass marketing and would probably be repelled by such a business.

There are companies that set out to offer a full range of camping equipment and sometimes also outdoor clothing (e.g. Cotswold Outdoor), but again most campers tend to pick the things they like from several suppliers rather than want to get everything from one. I've never heard of a camping equipment supplier considering also diversifying into operating camping sites. It is a totally different activity.

REI is well known for having staff that know their products, Sport chalet another and (D)icks Sporting goods also has trained staff. They also sell vacation packages You might take a look for smaller independently owned shops that specialize in the equipment your looking for. Also pay attention to on line product reviews. Some big outlets like Cabela's sporting goods have total vacation package deals with resorts they also own. There used to be places in the west where the store owner knew other folks and guides and would arrange for special package deals where you buy their gear they set you up and get you going such as fly fishing specialty stores

Amazon, REI, and many others, including Big 5 stores, etc.

REI