hello, first, very good, informative forum. thanks to all that have answered questions for others that have helped me also. now. i am making a trailer out of an aluminum boat trailer. i have a torsion axle that came on it with a 5x4.75 bolt circle. wheels on it now are 14x6. need to move up to 15". i know that most chevy rims are that bolt circle but does anyone know which ones i can use or point me in the right direction.may need to know model of car/truck they came on to search salvage yards for some. prefer 15x6 or 15x7 with a 2 or 3" backspace. i probably will mount 30-9.5-15 tires or close to it. im thinking caprice or something like that?