Edit: I'm having
so much fun thinking of how to use (up to five) castings of any level 3 witch/wizard/oracle spell to bypass physical obstacles.
Mostly by using Cob-directed Stone Shape to build past them.
Is there a ravine or river? Build a bridge (Buffed Engineering checks are used to ensure it can support the weight/is safe).
Is the gap too large for 90 cubic foot of stone (or is stone too weak)? Does the caravan need to go up a short but very steep hill or even a full cliff-face?
Enter
The Toad.
Warty, bringer of joy and wonder, has the slime ability.
With that and some ropes, a well shaped and
strong stone platform/crate can be placed on his back and Mina can Wild Arcana
Fly onto him, for 8 minutes a pop.
He can ferry whole
groups of people and animals and adamantine eggs at once, provided the stone crate is shaped to be fully in contact with his back.
So lets talk carry weight:
Warty is a Large Magical Beast; Quadruped with a strength of 20. According to d20pfsrd, that put his carrying capacity at:
Light: 133 or less. Medium is 134-266. Heavy is 267-400.
Large Quadruped triples those to:
399, 400-798, 801-1200.
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Now I couldn't find any way to make Warty
bigger - except for a specific magic collar, but we can still add magic:
Muleback Cords (+8 to Str for Carrying Capacity purposes) is based on the Bulls Strength Spell, and brings Warty to an effective Str 28. And that's then tripled for a Large Quadraped:
3600, 3603-7200, 7203-10800.
And
then we cast Aunt Haul:
The target's carrying capacity triples:
Light Load: 10800 lbs, or less
Medium Load: 10809 lbs - 21600 lbs
Heavy Load: 21609 lbs to 32400 lbs.
I dunno if he needs to make flight checks to move up and down with the fly
spell, but I'll hand wave that away with "apply many buffs to fly skill"
----
32400 lbs is
just over 14695 kg.