Hi Frank,
I wouldnt say a C14 and Titan or AP1200 is portable, what do you drive a truck
I have a G11 and its head weighs about 15-17kgs, a Titan or AP head weighs between 35-40kgs. Lifting weight is easy, manouvering weight is a completely different issue. Doing this in the field at night is not something you want to do.
On the 45lb limit, the Losmandy website now list 60lbs for the G11 wieght capacity.