Welcome from The State of Texas.
Happy Camping and congrats.
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I am not familiar with your TT, so my answer is maybe tainted. Mine does switch over automatically. I keep one tank off, as to know when one goes empty. I switch to the other and refill the tank that is out. I do that to not be totally out of propane at 3am, when is 10 degrees and the DW has no heat.
2012 Super Crew 4WD 6.7 PSD
2015 Cardinal 3800 FL
2007 Road King Black Cherry-Hers
2007 Road King Blue-Mine
1979 FXS Hot Rod Shovelhead