Thanks for the input. I have a couple of unused Tamiya stock motors and a couple of 2.5/1 reduction boxes, and found 2 matching ESC's will give them a try and work from that. The idea about auto elec motors sounds like a good way to go for 12 volt.

I am building this as a landing craft for my RC 1/16 tanks. i have no idea how much it weighs yet so on the weekend i will get some side on photos and find out how heavy it is

Thanks again for all of your help