Since it’s an emergencyehicle the tires are visually inspected daily and pressure checked weekly. A walk-around is done at the hospital after every emergentransport.
Speed-rated is unneeded because it does not get close to the tires’ 118mph T rating.
All Terrain is unneeded since the SUV should never be off road. (The Expedition has 4 very aggressive Winter tires mounted on 17" rims.)
Slime would be great if it would work and not ruin the TPMS sensors or cause wheel imbalance.
But I am practiced at quickly putting on the spare!
(Here I have learned not to use flat tire self-sealing ærosols.)