I made the mistake you are questioning. I bought too long of receiver drop thinking my 25' needed a 17-3/4" ball height. I found that I needed my ball near 22" to have a level Airstream. Hopefully someone with a Tahoe can give you the proper length. But I'd wager the shorter receiver will be the correct one.
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2021 Northern-Lite 10-2 & F350 DRW PSD, 600W Solar/Victron/600A BattleBorn
146 nights 31,000 miles (first 10 months!)
Sold: 2018 GT27Q, 74 nights 12,777 miles
Sold: 2017 FC25FB, 316 nights 40,150 miles
Sold: 2013 Casita SD17 89 nights 16,200 miles
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