Our new starcraft is locking the left hand van wheel every time we apply the brakes , tug is fitted with tow pro elite , also have tow secure breakaway and alko ESC , we had to get our daughter to tow the van home i might add with no wheel lock at all, ok the second tug did not activate the ESC it was also fitted with the same model tow pro elite , any ideas , our tow pro was flashing yellow an purple this means limp mode we think i also rang redarc they say that the tow pro can't lock one wheel , that i agree with so is it the ESC unit ??