As mentioned, confirm tongue weight limitations noted on the OEM receiver...., and also check any limitations on your selected hitch ball mount.
Last winter a fellow "Winter Texan" was having issues with considerable 'downward' hitch flexing with the enclosed cargo trailer he was towing behind his MH. I noticed he was using a 12" long hitch extender on his setup, he commented that it set the cargo trailer back further away from the rear corners of the MH during turns.
Upon further investigation we found that the tube style "hitch extender" was rated at only 350lbs maximum tongue weight. When we checked his loaded cargo trailer's tongue weight with my Sherline scale it came in at 650lbs...., well above the 350lb hitch extender maximum.
He went online and ordered a new "solid" steel hitch extender rated at 750lbs (in lieu of a hollow tube style). Utilizing the new hitch extender resolved the hitch assembly flexing issue.
Just food for thought when using hitch extenders......., because I see a lot of them utilized behind MH's towing trailers.
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)