Ah so... ... ... ... ...
Then Sir, you are good to go. Some folks convert their large 5ers to GN hitches. We do not recommend this as it places additional torque on the 5er hitch box as well as the upper section of the coach.
The smaller, lighter 5ers seem not to be bothered... ... ... only the larger ones. And being that you are rescuing a unit from someone, it probably is not a factor.
One more thing on a little different note. Folks that take their children camping make memories that last. Generally speaking, kids that went camping will eventually take their kids camping. It is great family time with huge rewards.
Happy Camping!!!Oo.