Look Pee!!!…….Looking from your pictures the only working at height will be if you’re reaching out to work on the A-frame which is nothing much if it’s all round welded. Unless you are trying to tightened up the travelling block (rollers on the I-Beam).
One question will be what about the working nature around your units do you need to extend your reach to work on the side of the rig like some of our rigs do? Like removing of hoses or lines for feed, discharge or returns?