I like most of this but I have to strongly disagree with what you say about the paracer. It's already way better than the bronto imo, it's much faster and its smaller size makes it much easier to maneuver and lets it build a canons/ramps that aren't 100 ft off the ground. PvP wise its already a powerful soaker, and giving it more hp and the ability to stomp turrets and metal is pretty ridiculous. I think it could just use a buff to movement speed, being the lightest of the platform saddle gang.
Bronto's model and animations are pretty outdated. It does very little damage for something so big. It doesn't do much useful besides being another piece of meat to absorb turret fire, mobile bases are too risky and can't carry enough weight. It's too impractical for hauling cargo or a mobile resource farming station because its so slow.