Personally, if the back of the pickup had a firmly fixed metal top, yes. Plastic top, no.
if you need to make do (I wouldn't), then get a box trailer or find someone with a ply-lined van and a secure grill between back and front - you may have a seat belt on when you brake at 40mph, but 50kg of tup won't, and they're lousy drivers too.
I assume you've tried waving money at folk with trailers...