Tyre size 1996 Jurgens Penta Caravan - RVs

Question edited for a lot more clarity, spaces and CAPS.
Question moved to RVs.

It appears to be Australian and no longer in production. Can't you grab a tape measure and measure the one on it? Or look on the A-Frame to see who built the rolling chassis trailer it sits on.

https://www.google.com/search?q=1985+evernew+20+ft

https://www.google.com/search?q=1985+evernew+20+ft+brake+drum+size

..

https://www.caravanparks.com/35?forumaction=1&loadcategory=1012&loadpost=250057769

There should be a tag on unit somewhere telling you both of those things.

There are quite a few manual websites out there -- not knowing the model is a challenge. Hopefully this link will continue to work for a while:

https://www.gocaravanning.com/caravan-specs/Sprite-Caravan-Data.html

Please restate your answer in the form of a question.

Recommend you contact your nearest RV service center to have this done. This will ensure proper and safe installation. The last thing you want is a fire from improper wiring solution.

Try this site: https://www.gocaravanning.com/caravan-specs/ABI-Caravan-Data.html

unless you have ahome built unit
most use standard axles with various hubs fitted
That menas same bearings but different hubs with different stud patterens to fit different rim diameters and wheels to fit towing vehicle as well
There would be no problem going up in rim sizes if that is the case because you could purchase the hubs to suit the rims
The only thing to watch is tyre to body clearance as the bigger the rim the less rebound clearance to the body so tyre profile will be critical or used spacers under the springs to lift the body
As to sway and controllability , you should be using stabilizer bars anyway regardless of what rims you are using