Steering wheel vibration, hollow body noise at 45/55 mph

Completely rebuilt front end of van with quality parts 10 months ago, and had it aligned. No problems in town or highway. Had to have van towed yesterday by roll-off tow truck. Driver winched van up, but front wheels turned too far left and caught lip of bed and the tire was jammed violently into it. Driver tried to force tires to straighten out by winching, but tire dug in so hard winch began to drag. Driver finally let up, I straightened wheels, and driver finished loading. Next day when I got van back, got vibration in steering wheel I never had before, at 42 mph and up, and a bit of a hollow body howling sound. Next morning had front end inspected, no apparent suspension damage, etc. Had it aligned. Still got steering wheel vibration, etc. Had tires balanced and rotated. Took for longer test drive. At 55 mph and up, got worse steering vibration and loud body noise (low howl). In case it was just coincidence, I had U-joints checked and okay. Changed tire involved with spare. No difference.
Could this be the wheel bearing of the involved wheel, or what? Nothing was wrong two days ago. The van has high mileage, but keep it up with quality parts, etc. I'm lost, and so are the mechanics. My wife and I live on $1,100 a month, and we can't afford this trial and error repair thing.