I have been asked to take a look at your question.
There is no sales tax per se. FOR TEXAS
YOu have to charge and collect what is called an occupation tax. Please see the following publication: http://www.window.state.tx.us/taxinfo/taxpubs/tx96_199.html
You will note that if your crew is not providing the services listed in the publication you do not have to charge tax.
Your services as stated do not appear in the services that have to be sales taxable:
LOUISIANA: I will get that for you. In the mean time, please read this link, scroll to the part about non-resident contractors and subcontractors. http://www.rev.state.la.us/sections/business/sales.aspx