Looking at floor plans for your 2016 and the 2019, the toilet is mounted about 6 inches farther forward in the 2019, and is angled. You would most likely need to duplicate that, i.e., you'd need to move your toilet forward 6-8 inches. That would require either moving the black tank forward the same amount or replacing it with a new tank with a new toilet connection location. OR modifying the tank to move the toilet connection; not easy.
Sure doesn't seem worth it to me. You might try some kind of tank topper instead.
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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