I think the limitations of using weight distribution on some of these vehicles is the hitch attachment method. A WDH can torque a receiver mount up and down more than having dead weight ride on it. I have only seen this restriction on select unibody vehicles and have not ever seen it on "body on frame" vehicles.
My preference is to use a RWD or AWD drive vehicle for heavier towing because of traction. It's hard to shift weight to the drive wheels of a FWD unless backing up a hill (been there before). When a FWD loses traction it also loses directional control. I do tow 1500 lbs with my VW TDI, but the heavier diesel helps keep the drive wheels planted. You need to pay more attention to the front end unloading on you than other vehicles.