No PP tax in Nebraska. If you register with the state of NE, then its 5.5%-7% sales tax depending on where you live. If you USCG register, then you don't even pay sales tax or register it at all with the state of NE. State registration is $65 for 3 years.
Annual Real Estate taxes are 2-3% depending on where you live. My neighbor pays almost 18k a year. Mine are just over 6k a year.