That is absolutely NOT what the chase vehicle is for. It's there because the visibility from the cockpit is so bad that judging height in the latter stages of landing is very difficult. Plus the main wheels have very little suspension and slowing it down is a trick. So, the chase is there to count down altitude to the pilot in feet so that he can feel his way onto the runway. Get that bit wrong and it will knock your fillings out.
Secondly, chase never tried to position itself under the wingtip of a moving U2/TR1. Your thinking of an old episode of Thunderbirds. It's a chase vehicle with a radio, not International Rescue. Hey, good idea for the SARH thread!!!