Rear shock rebuilding / brand questions or advice?

So I've done some reading and can't really find a great answer as things are somewhat subjective when it comes to after market shocks. I've got icon shocks in the rear and 1 is leaking so I assume its blown a seal. They've got probably around 30000-35000 on them. I've read that it's about 200-300 to have a shock rebuilt/serviced. I'm not opposed to doing it myself if I can source the gas? That's in it locally. Has anyone done any rebuilding? Is it worth them time.
Should I just source a new set from a different manufacturer? I didn't really need icon in the back I just got them to match. The front extended travel because of the lift.

I don't really gaf if they match, I like them to last longer that seems short life for a truck that sees mostly highway driving.

Last question, is there any significance to the fact that the shock that is leaking is the one closest to the exhaust piping ? It's not touching but I'm sure some heat radiates out of that and I'm thinking that it maybe caused the shock to fail prematurely. Or it could just be coincidence.

 

I vote to rebuilt them, whether or not to send them off to icon, take em to a local shop, or do it yourself. Rebuild is most economical/beneficial.
Icon makes decent stuff. Not quite as good as some of the other high end shock and coilovers companies, but still way worth rebuilding.