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.
Jester
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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