Ash, that stuff might be a bit thin, impossible to tell. If it's too thin it will just tear when you transport it. Better to present the rug to a customer with no wrapper than a tatty torn one!
The stuff Pierre linked to looks great, the heavy gauge black stuff. That won't rip when you slide it in the van! I'd recommend no more than 24" because you need a snug fit otherwise the wrapping will belly out and catch on things and you'll be forever fighting it. Of course you can tape it up but that's extra cost and hassle (depending on the scale of your rug operation!)
I normally cut the plastic about 3ft longer than the rug and simply push each end down the middle of the rolled up rug, so it can still breathe. I always advise them never to leave rugs rolled up in plastic too.