Not to my knowledge. 2" square tubing, 2" and 1 1/2" water pipe, boat seat and some 3/4" conduit bent for rifle rest and chair arms (my buddy wan an electrician) is all that you need for the chair. I did use some schedule 80 1 1/4 pipe for the boom so it would telescope into 2" square tubing. The chains and turnbuckles add stability to the chair by taking up slack in the receiver hitch/2" square tubing.
This picture shows chair better. Started out as hunting chair only, after manhandling a couple of nilgai cows, added the boom and boat trailer winch in pickup bed.
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