A hitch extender will not reduce the capacity of a cargo carrier itself, though most extenders do have a max 350 lb tongue weight limit, such as the Trailer Hitch Extender for 2" Hitch Receivers - 18" Long # e48YR.
That said, extenders like # e48YR also reduce the tongue weight capacity of your hitch by 50 percent, so you have to go with whatever is lower - 350 lbs or half your hitch tongue weight capacity. For example, if your hitch had a 500 lb tongue weight capacity and you used the... view full answer...
While the Trailer Valet XL Trailer Dolly # TVXL25 does say it is intended for use on flat surfaces a slight incline or decline will not be a problem for this dolly. Trailer Valet has tested and allows for up to a 10% grade or 5.7 degrees of incline or decline.
I would not recommend using the Trailer Valet on any surface that if your 2019 Jayco Jay Flight was disconnected from your tow vehicle, it would roll away without a wheel chock. view full answer...