never been to the flyin j one but one exit north, 54th go over I5 and about 2-3 miles on the right just past PRS is a nice one, and it doesnt have rails on the sides like most, its in ground if your trailers real wide you wont have to worry about scraping the fenders. just drive over it and drive off, they only charge if you want a print out.
dont get me wrong your probably fine on a scale with sides ive just never pulled a trailer over one and have been on some retardedly skinny scales.