I probably would replace the tires right away without even looking at them... I would also update the converter/charger unit to a smart mode charger setup ...
As you may be aware some campgrounds have the ten year old thing in effect. Both my trailers are going to be hitting this shortly.. Actually my 2008 trailer is the only one on the road.. I plan to tell these folks it has been upgraded to a number they like to hear... My units look great all the time anyway - definitely not trailer trash appearance...
For me however if the campground has the old age trailer thing I don't think I would want to be there anyway haha... I don't know how to spell resorts...
Roy Ken