My angled extension is in a storage slot on the deck with a handle on it. I just lift one end of it with the tip still resting in the slot and shoot the boom onto it. I never have to pick up the full weight of the extension. My extension is 6'. I couldn't even stow the boom with it on. If I could it would stick off the side of the truck about 4'. I would caution you on building your own unless you are that skilled of a welder and totally understand how to build it so it can withhold the forces you're applying. Mine went through a special heat treating process to ensure the steel and welds would be strong enough to maintain the 3300lb rating it has. Building something like that is way beyond my understanding. In the pic its the red object on the drivers side. Maybe you understand all the welding and strength factors but I dont.