Buying Used in Texas...Questions

[Slidellkid]

I have made a deal for a bay boat in Texas. I have a couple of questions.

1. I am buying from an individual, will I have to pay taxes in LA? Do I need any documentation to show the sales taxes were already paid?

2. Texas does not require a title for boat trailers. The owner does not have a title for the trailer but he does have the trailer registered. What will Louisiana require from me to get the trailer registered in my name?

Thanks,

Dan