Too late for you now, maybe, but I see 5 (?) toughboxes aboard. If they were all converted to the "nano" version you would save an advertised .7 pounds per box; totalling 3.5 pounds. AMark also mentions use of aluminum gears inside for .85 lb. per box. Of course, this all costs. If you hadn't blown all that loot on 8" mechanum whee-uuuuls. . . .
Best of luck guys. Hope to see you in Atlanta.