Last I knew there was an FS parking fee at 19-Mile but not Imp
Trail erosion on Middle Carter has created a trough such that the HP is off to one side, step up to the E for views of Wild River
South Carter has 2 summits according to the USGS map
http://www.topozone.com/map.asp?lat=44.2879&lon=-71.1797&size=s&symshow=n&datum=nad83&layer=DRG25
the NE summit is just a few steps from the trail near the sign while the SW requires a bushwhack of 100 yards or so
White Mountains (NH/ME) > Carter Mountain, Middle and South > Additions and Corrections