Have been running this loadout on the 5J recently. Racing round the battlefield, flying gracefully through the air, dispensing green delight for all and sundry... Not sure where I'm going here, but this thing is fast (enough), gets good air with the JJs, and delivers pinpoint pain with the pulse lasers. The issues are heat - even with 18 DHS you have to be careful, especially on Terra Therma - and there's basically 0.5 tons leftover but no slots to do anything with it. Sure, you could rip out 2 x JJ and throw in a BAP, but that doesn't really help. Oh, and this thing shreds lights. The pulse lasers are great for dealing with the little nuisances, and you are fast and agile enough to keep them in your sights.
If you want to use the tonnage up you can rip out AMS and add 2 JJ. You are fast and can go w/o AMS. Oh and all the enemy need to do is to say "I DON'T BELIEVE IN FAIRIES!" and Boom you are dead.
The Treb uses .5 ton JJs, so you would still have a ton left over with no slots. Having it the way it is is just fine, I like the build, looks pretty solid.
I do believe in fairies! I do! I do! I am desperately searching for a Treb build for this variant that isn't terribad for me. I'm kinda tempted by this build. I'm considering modding it as followed to make it super speedy and super jumpy! WEEEEE!