My buddy Mike had almost the exact same thing happen to him out in Nevada, not near a town or anything, just a long stretch of 95. He was hauling a load of mixed scrap metal, not cars, but the same idea. He stacked all the heavy iron beams on the front of the flatbed, near the cab. An old timer at a truck stop in Tonopah saw him tying it down and walked over, told him he had all the weight over the wrong axle and his steering would get real light if he hit a big bump at speed. Mike said he felt like an idiot but he spent the next hour redistributing the whole pile, and sure enough the truck handled way better after that. Funny how a total stranger can spot something you've been doing wrong for years in just a few seconds.