One problem with a V-nose cargo trailer is there isn't enough room on the tongue to install a good weight-distributing (WD) sway-control hitch, such as a Reese Strait-Line or Blue Ox SwayPro or Equal-I-Zer. You can add sway bars, but they aren't nearly as good as a good WD hitch with built-in sway control, and they don't distribute the tongue weight.
If your only concern is to back the front of the trailer further from the motorhome, then a receiver hitch extender can do it for you. The problem with the extenders is that they reduce the hitch weight capacity by about 35%. Here's a Drawtite 14" extension that is limited to gross trailer weight of 3,500 pounds.
That's probably not enough weight capacity for your cargo trailer. My 7x14 cargo trailer has GVWR of 7,000 pounds, and is often loaded to around 6,000 pounds with tongue weight of about 800 pounds.
I have a Reese 13" extender that says reduce hitch weight to 65% of hitch weight capacity, plus it has a tongue weight limit of 400 pounds when used without a WD hitch, or 650 pounds when used with a WD hitch. I used it on a utility box trailer that grossed less than 3,500 pounds and had hitch weight of less than 400 pounds.
So to use that one with a V-nose trailer I'd need to find a WD hitch that would bolt onto the short tongue of the v-nose trailer, plus I'd need to manage weight in the trailer to be sure I never exceeded 650 pounds tongue weight. Exceeding the weight limits of your hitch system indicates you were standing behind the door when they passed out the brains. No problem for me because my Car-Mate flat-nose cargo trailer has plenty of room on the tongue to install my Reese Strait-Line WD hitch.