Roveress Evo - Youre not getting 5.5 tonnes without using hydraulics.

Side Swipe - Whats the bar made out of?

El Camino - Is the skirt one piece of metal? If so, this robot is grounded. Besides, FBSs dont really need skirts. Also, how can it be a dome shape, and invertable? You want it to be a cylinder.

Bubble Blaster - Other than the hydraulic preassure mentioned by Joey, I dont see any problems.