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A wider tire will help but you will want to ensure it has the proper load rating, somehere around 2,000 lbs.

Being you are in very warm areas, you should look for a very good temperature rating.

You will want a radial trailer tire.

Something like this:

https://www.easternmarine.com/loadsta...re-rim-ptd

You will need to verify that your fenders can handle the new size. You can order larger fenders, mounting brackets with or without marker lights.

E.G. marker lights:
Right - https://www.easternmarine.com/karavan...6-00088-wh
Left - https://www.easternmarine.com/karavan...6-00087-wh

Karavan parts - https://www.easternmarine.com/karavan...iler-parts