I have a very scruffy looking LR bullbar exactly the same as yours and would've got it dipped with a recent batch I put through, but I thought they'd never touch something like that! Did you have to drill the hoops?
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I drilled small (~4-5 mm ) holes at each end of every pipe section in the vertical plane. This does not weaken the bar.
I did not drill the lower c-channel. They lifted it out of the bath on a slight angle so I have a huge sacrificial anode (about 1-2 kg) in the LH "dumb iron" of the bar. :D
When gal dipping stuff with threaded holes and nut serts and the like its best to fill them with silicone then wipe it into the threads with wire
The silicone wont burn out and its stops the gal sticking in the threads a quick poke with some wire after gal dip removes most of the gal and a quick run through with a tap of the right size and good as new
We use to do this with gear for underground rigs mainly manifolds and other exhaust stuff as it was all gal'd so it would last longer as it all had coolant running through them