They are moving/relocating, not vacationing.
OP can find pet-friendly hotels.
While in the car secure each into its own bag which goes into its own latch-box tub (they have secure lids). If you have to get a long tub buy some non-stretchy nylon luggage straps to secure the tub lid to the tub, they're like $7 a pair at WalMart or Target. Don't plan on stopping more than a few minutes for people pee-breaks or to get take-out food, you don't want the car cooling off so your snakes get cold.
The latchbox transport tubs can become overnight housing, just slide a UTH regulated by a thermostat under each one. Line the tub with newspaper and provide a water dish and a hide so they can spend the night in relative comfort.
Since given your other thread one of your snakes is sick and the other is likely to be, look now for a vet in your new location in case the stress of moving causes the RI to flare back up.