I tubed and oiled my horses before a 36-hour (total with overnight stopping) cross-country move and gave both preventative doses of omeprazole starting 5 days before and continuing a week or so after. The 25-year old got bute for 3 days (I thought she was going to be crippled after being on the trailer for 2 days, but she surprisingly wasn’t). The younger one got bute after day 1 on the trailer (arrived late day 2).
Nobody got grain the day before, during the trip, or the day after. Everyone got oral paste electrolytes the day before, the 2 days of the trip, and the day after. They got free-choice grass hay during the trip.
We arrived late at night, so I kept them in stalls overnight, packed feet and wrapped legs, gave free choice hay and turned them out early the next morning (they ran around like ninnies).
I had a LOT of anxiety about this (trailered them cross country myself), but they ended up doing great. One of my horses was pregnant and I was CONVINCED she was going to abort, but she didn’t, and she’s fine, and they are happy and healthy and doing great.