A livestock van is a van at the end of the day. The problems you face are the slope of the ramp as Manian says, which I think was discussed a few months back and is now 1:4 -not sure. Another issue is cleaning out and you have to sign to say the vehicle will be disinfected, which can't be done effectively unless your boarding is completely sealed. You also need a proper livestock roof vent. I got pulled up about that by the vet and by animal health later when I took a ram to slaughter in my ply boarded Vauxhall Vivaro -it was 10 minutes down the road and my wife was in the back with him! I was quoted £100 +VAT to fit one, which I have to do now because the Poultry Export vet won't let me go without it.