I-75 to Washington PA
I believe you mean I-79?

Suggested bypasses:

Take I-470 around Wheeling WV, I-270 SOUTH around Columbus OH, I-465 SOUTH around Indy, I-255 SOUTH around STL. Stay on I-44 through Tulsa OK, and at OKC take I-35 SOUTH to I-40. Note that there's a $5 cash toll between MO and Tulsa, and $5 cash between Tulsa and OKC. If you take the Kilpatrick Turnpike around OKC, it's electronic toll only, your EZ-Pass is not accepted in OK. It's pay by plate without a Pikepass, and quite expensive (over $5).

US-95/CA-63 to Twentynine Palms.
I believe you mean CA-62. Another option is take I-40 to Kelbaker Rd, go south to old 66, go west to Amboy Rd, then south to the "Stumps".