I agree, go with the 1,200lb rated WDH.
Based on a recommended 13% to 15% loaded tongue weight range (of actual TT loaded gross weight) the 1,200lb rated WDH (minimum) will provide the required support for loaded tongue weights that are most often seen with a 8,700lb GVWR TT.
With any WDH proper adjustment is "key" to insure optimum TV handling of the TT.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)