So I have been looking at the Powerful Shape feat for druids:
Prerequisites: Wild shape class feature, druid level 8th.
Benefit: When in wild shape, treat your size as one category larger for the purpose of calculating CMB, CMD, carrying capacity, and any size-based special attacks you use or that are used against you (such as grab, swallow whole, and trample).
I've never really considered carrying capacity once you get to a high level druid because there comes a point where the weight of your own gear becomes a moot point. But then I sat down and started doing the actual math.
A druid with Wildshape high enough, Ant haul, and the Powerful Shape feat can move disturbing amounts of weight.
Sample: A druid with a 16 strength starting. He gets a belt of +4 strength, bringing his score to 20 strength. He wild shapes into a huge earth elemental, bumping that strength up to a 28.
On the chart, a max heavy load for a medium sized creature is 1200 lbs. But you've wild shaped into something Huge, which means you are treated as Gargantuan for your carrying capacity because of this feat. You're a solid stable rock, not standing on two legs, so you get the quadrupedal bonus. Multiply that 1200 lbs. by 12 = 14,400 lbs. Casting Ant Haul on yourself triples this amount: 43,200 lbs. You know what weighs almost that much? A 0-4-0 saddle tank steam locomotive. A druid can carry a solid iron steam locomotive on his back with some strain over long distances.
This gets crazier when you realize that a character is allowed to lift and carry at 5 feet around as a full round action double their maximum capacity. New amount: 86400 lbs. Do you know what weighs almost that much? An 18 wheeler super semi truck complete with 40 ft. trailer.
Then we get to push and drag. The druid can push or drag 5 times his maximum load. 43200 lbs times five = 216,000 lbs! Roughly 108 tons. Do you know what weighs almost that much? AN A380 AIRBUS JUMBO JET. I'm talking the modern, bigger than the Spruce Goose, multiple floors for seating, has a conference room, engineering marvels. The Druid can drag this jumbo jet without wheels.
So I guess my question at this point is, in this world of wooden, brick, and stone houses, what if this druid wants to do things like push over small buildings, yank the support pylons from a dock, drag a ship under water, etc? I know there are some checks for bursting objects, doing damage to objects, and so forth, but they all seem directed at smaller things, like knocking a door off it's hinges. The break DC for an Adamantine Door is 40 for instance. Impossible for even the brawniest raging Barbarian, but this druid has a +9 strength modifier and a +12 bonus for Gargantuan size while a huge Earth Elemental, he is capable of taking a 20 and folding that Adamantine Door like Superman. I feel like there is enough math for me to entertain the Druid's attempt at pushing over a house seriously.
What is the verdict on this? Is there a check for doing something within your weight limit? Can a Druid like this just decide to push the Blacksmith Shop down the street or literally knock over a liquor store?