I was wondering if it is true that straight load trailers are bad on horses legs? . I mean trailering a horse in any trailer for like seven hours or something would probably be bad on their legs even with bedding and mats. I am talking about a straight load trailer, with mats ( no bedding just mats) , 15 or less years old, driving for 30 min. - 1 and 30 min. ? Would their be the same amount of pressure on the horses legs as in a sland? More? Less?