Thank you for your responses. Taking out a few of the lenses should help the weight.
I do have a 20X optical zoom point and shoot that could be my back up camera. But, after all my work with my DSLRs I am reluctant to go back to that.
One reason for the two bodies is the dust on a safari. Changing lenses often results in dust issues. Also, the animals often are at varying distances, so having two cameras with two different lenses is helpful and quick. For these reasons, I am considering only taking the two Tamron lenses. I think they would cover quite a distance.....close and far.....?