@Ryan ******
Thai Immigration usually only hassles you if you have been to Thailand before, have dreadlocks, wearing shorts and/or a T-Shirt, or if they are just in a pissy mood.
And they ask questions in English but don't understand, or care about, the answers because they usually don't speak English.
Just carry a file-folder of all your paperwork and have $300 IN CASH to show them. And just show them. Don't hand it to them.