Certainly appreciate all the advice .... since photo's will not be the priority of this trip I will have to bring a limited amount of gear.

Under consideration: 5DS-R, 5D MKIV, 100-400 + 1.4 TC, travel tripod, for wide angle either the 24-70 or 16-35 (not sure yet), ND filters

This will fit in a small bag and not be too cumbersome with a car full of people.

I can get out to 560mm with this arrangement.....unfortunately I think bringing the 600mm will have to wait for another trip dedicated more to photography.