There is a wide variety of F53 chassis specs so you need to look up the GVWR and GCWR numbers for
yours. Per this link:
https://www.winnebagorvsource.com/sp...an-29v-tr51643
Your GVWR is 18,000 pounds. That is the absolute maximum that the motorhome can ever weigh.
While Winnebago does not list the GCWR, from a Ford doc is appears to be 23,000 pounds.
GCWR minus GVWR = 5,000 pounds. This number,
not the tow hitch rating, is how much weight your chassis can tow unrestricted. For you, the numbers are the same but that's not that common.
Why is this important? My 22,000 pound GVWR F53 chassis has a GCWR of 26,000 pounds. That means we can only tow 4,000 pounds unrestricted even though we have a 5,000 pound hitch, just like you do.
Unless you have actually driven your proposed toad to a CAT Scale and weighed it with no one inside, you can only guess at it's towing weight.
Remember, just because the motorhome can get all of that weight moving does not mean the motorhome can stop it safely. You must have a supplemental brake system installed in whatever you tow.
Hope this helps,
Ray