Most states (Texas included) exempt personal-use RVs from commercial requirements, so you won't have to worry about going through the scales, needing a CDL, etc. Generally speaking, the United States operates under the principle of reciprocity through an agreement called the Driver License Compact. In a nutshell, this says that, if you're legal in your home state, you're legal in the other Compact member states through which you travel.
We see lots of RVs with Canadian plates down here, so hitch up and c'mon down!! :-laf
Rusty