If you want to take in Guadalupe Nat'l Park from Carlsbad, then 54 is an excellent road to Van Horn. If you just want to head east on I-10, 285 is the shorter way.
Guadalupe has some dry camping spots with flush toilets. McKittrick Canyon is a nice hike as is 'the Peak' (which is strenuous). It's a pretty area if the weather cooperates. It might be hot now and the winds can be bad but usually in the spring.
There is a Passport America park in both Van Horn and Ft. Stockton on I-10 with good prices. Have a good trip.
Full-timed for 16 Years
. . . Back in S&B Again
Traveled in a 2004 Newmar Dutch Star 40' Diesel