National Business Furniture offers a Heavy Duty Folding Chair with Plush Seat for $41.95 with a tubular steel frame and scratch resistant baked enamel finish. The padded seat has two and a quarter inches of padding with double hinges and double riveted U-braces for additional support. If you want heavy duty without the padding you can buy an all metal version from Bridgeport with a seven eighths steel frame, double hinges and triple steel cross braces, non marring leg caps and it folds down into a normal folding chair size. These will run you about twenty dollars a piece plus shipping.
If you are looking for you camping furniture and have people who routinely weigh over two hundred pounds you will need to invest in some heavy duty folding chair models for the outdoors. Luckily there are several companies that have realized the market for Plus and XL sized people is growing and they still enjoy the outdoors. Everywherechair.com caters to those weight challenged people who want stable seating while camping, in the back yard or at sporting events for their kids or even outdoor concerts.
You will pay about a one hundred percent premium over a regular duty folding chair for the outdoors but it will last more than twice as long. They have an eighteen inch heavy duty aluminum frame directors chair that is three inches wider in the seat area than standard folding chairs. The seat is polyester and is mildew and stain resistant. Pricing is just over eighty dollars ($81.95). Another heavy duty chair available at Everywherechair.com is the Bubba High Back Quad Chair from Travel Chair. It runs $49.95 and features a wider sling seat, detachable pillow headrest and cup holders. The seat and back fabric are 600D nylon instead of 400D and are reinforced with seat webbing and all stitching is bar tacked and double stitched throughout.
One ultimate heavy duty folding chair is the Maxdaddy Monster capable of holding 400 pounds. It is constructed of 19 mm steel tubing and has a 27 inch wide seat of two layer 600D nylon.