Well I didn't read everyone's responses, but in WISCONSIN it was the LAW that you had to display your deer so it was viewable by passing vehicles. That rule was finally changed a few years back, but I would bet that 90% of the hunters in Wisconsin are not aware that they no longer have to.

WHen ever I transport my deer, I alway have the body cavity facing INTO my truck bed, so that people in other cars do not have to see a bloody cavity.