Just made it back with my latest deuce. And I even got to OFFROAD it on the way home.
Got off I-37 to get a little diesel, then got back on the frontage road and drove that for a few miles... until it just ran out. Backed up a couple hundred yards and took the slightly beaten path back onto the interstate spur that others had boldly blazed before me.
Anyhoo... possibly bad news ODw/Envy.
I hopped in your truck and pressed the brake pedal and it went straight to the floor with no resistance whatsoever. I tried pumping it a couple of times but nada.
Two of your tires are completely bald. One of those doesn't appear to have any air pressure in it. The rest of the tires seem like they've got some pressure, tho.
I picked up a truck once that the break pedal behaved like yours and the problem turned out to be slightly rusted stuck WCs. The fix was easily done with some hose, barb fittings, and a small 12V air compressor and a regulator. You could probably use a pump up sprayer instead of an air compressor tho.
Another thing it might be is the vent on the MC cap. I bled my brakes and it only barely improved my pedal. Then I noticed that with the MC cap off, I had MUCH firmer brakes, which lead me to investigate the vent. Could be yours has a similar issue.
I didn't check your brake fluid level, sorry. I was in a hurry.
Flipped the accesory switch and got a medium weak low air warning buzz. So the batts have *some* juice. I didn't try to start it, tho.
Good luck.