This does not surprise me one bit. I believed TD planned this way more than what was thought by LE and the public at large.
The blood of his on the truck, he could have made a small cut and swiped it on there purposely. He could have stashed some form of transportation (ATV, snow mobile, anything) up in the area days/weeks before taking the girls there. He had a 3 day head start.
Food and supplies he could have had packed and taken with him as he left the abandoned truck leaving his other 'necessities' ID, wallet, keys, phone to be purposely found...he is a trained survivalist. He could have stocked up on cash, not having to use a credit card or leave a paper trail. He pulled a 'gone boy' IMO.
A major strategist with a plan to get out of dodge ASAP, change his appearance, and lay low in any number of sparsely populated areas. He's evaded capture from highly skilled searchers for over 3 weeks now. I just don't believe a man capable of horrifically murdering his own beautiful daughters who planned to kill himself as well wouldn't have done so right there at the same time.
I hope they find this monster TD ASAP. The thought that he could disappear into parts unknown evading capture and justice for his actions would the worst possible outcome for everyone.
JMO