Foretravel Gas pushers

Hi out there, does anyone have information on the Foretravel 460ci pusher, with 4 speed trans.? Good points, bad points, whatever. I understand that Foretravel produced Ford and Chev pushers along with diesel.
Foretravel Gas pushers

I used to own a rear gas pusher an older Foretravel for several months and did not have any problem, however, I understood that most manufacturers had engine overheating problems with the rear gas engines.