It really does look comfortably settled into the soil.. Yuck. It's like extra-height form-fitted wheel chocks. If you have an adequate bottle jack and wood cribbing available it'd probably be worth spending a couple hours working to get the bus elevated a bit. Especially so on the front axle: the rear gets drive torque applied to help it "climb" out, but the front has to be brute force pushed instead. That's tough when the tranny won't give you lots of torque and the tires break their traction anyway.
The work could be reduced by using chain or (big) ratchet straps to prevent the suspension unloading as you raise the frame. That'll reduce the jacking needed to get the tire lifted out of the hole, which can then be backfilled with pea gravel.
Fluid is likely burnt: a few minutes with the torque converter stalled (engine revving and wheels not turning) could generate huge amounts of heat. I've read recommendations when doing a stall test on a torque converter not to hold it at stall for more than 20 seconds or so.
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