I thought about it but did not do it, was looking for a way to carry when im not towing my toad.
I was not sure if it would drag on driveway aprons as well as dig in when backing up on an incline at some campsites. That seems to me to be a problem on short wheelbase MH's, like my 24' / 158" WB.
If I used a riser on the shaft of the hitch, then the yaks might be too tall for my comfort. You might be able to get around that if you carry 8/9 ft yaks.
I bought a Thule rack for my toad and carry my yaks/canoe that way.
when I do not bring the toad, I bought a one person Sea Eagle 285 to fish out of. That packs into a storage bag and has worked well for 8 yrs or so. No leaks and it stores right on the rv floor in transit.