I saw your post and that there have been no responses so far. You might want to check into local area Facebook pages for more
'connection' with who's doing what. Facebook is rapidly taking over for the forums for keeping up with local goings on... Some of the newer cachers I've spoken with don't even know what the forums are...?
Secondly, summer is not a good time to do the power trails in Nevada, Arizona, California, Utah! It can easily climb to well over 100 degrees and locals know to plan ahead of time, but they are also willing to revise plans as current upcoming weather is forecasted. It's very important to keep in touch with current forecasts!!!
Personally, we did the original ET Hwy series in the middle July. Heat topped out at 113 degrees. And even though the majority of the trail is grab n go (travel), it's still really taxing. Fortunately, we had a cooler full of just ice, bandanas to soak in the ice water to wrap around our necks, and excellent A/C in our car. All that said, it's way better to do the desert power trails in the winter with much much cooler temps and little chance of rain or snow.