What a fucking douche. Large animal like that isn't made to support its weight with its ribcage. Especially ratcheted down to a trailer that will impart every single road bump in such a manner that will momentarily increase the effective weight strain. (Think increased G-forces)
If you have cattle, you need a proper trailer.
If the animal is lame, the vet will make a house call.
If it is in such dire straits that it needs to be moved "right now" like this, then pick a vehicle that doesn't need to stop at the fucking gas station on the way.