What is the real world practical limit for towing with our beloved Gen. 1 D-100 trucks with the V-6? I see I can get a hitch rated up to 1000/10K with WD. But is this practical? I do want to tow a lighter trailer. Are the oil & trans fluid coolers and radiator large enough to pull something bigger than a pop-up? Would I need to find a 120AMP alternator as well?