Welcome, in the same boat when it comes to needing everything to be portable. After a lot of experimenting I finally settled on a MARKIII style jabod with a small modification. I stopped cutting a hole for the air pipe in the bricks and just put the pipe between two clay bricks and fill the gap with a split firebrick. It can't be beat for forging small things and you can set it up quickly. I first used a box without a bottom so I could put a bucket by the table and push the forge off the end to get the kitty litter back in the buckets but I'm now using a Webber kettle grill and just leave it assembled. It's a grill after all. I did notice that since I no longer have a permanent setup in the woods I forge a little less though. Anyway welcome aboard, be safe, and remember it's supposed to be fun.
Pnut
Split hard firebrick is available commercially. The TSC near me sells them for about $3.00 a piece. $2.76 iirc.