They won't stay clear for long. The moisture will cause it to turn green I believe from all the water inside
It also looks as if he is running fairly low pressure. 5 gallons @ 100 psi wouldn't get my truck to ride height any day... Looks cool though.
Those are totally hydraulics pumps canisters they made clear ones for a few years then prohopper decided they were junk. As for the leds im sure you could put them in there however Im really assuming that setup is for show only or the truck is a trailer queen cause yah daily use those things would be more a hassle then all that chrome is worth.
i personally hate when compressors and tanks are mounted in the bed of a truck. but this setup is just plain sexy, and deserves to be shown off!! i could see the tanks doing a great job. they are built similiar to large pnuematic air cylinders used on semi trailers, and they last a long ass time under extreme forces.