in '08 we did Cottonwood on RTR and it was hot, dusty and LOTS of mosquitos. One of my buddies got a flat and we got devoured when we stopped to fix it... As long as we were moving it was OK. We stopped and paid dearly to the mosquitoes.
I am jealous-- enjoy the ride! ANd it is impressive that you are doing both rides-- do they overlap any of the route?
train safe-