Hi i have a 18 ft utility trailer with 15' wheels on it double axle... I dont haul many heavy things on it but need new tires.. I will be moving a 1970 beetle on it for about a 6 hour drive. "aprox 1,900 pound car" Can i get away with getting a cheap set of 15' regular tires rather then then 6 ply trailor tired that will cost me 120.00 plus each.. i will probably never haul a car again... What do you guys think?