This will depend on the chassis that is under it More complicated yet is several manufacturers used "SunStar" for a model name. Including one company that built a "SunStar" Fifth wheel
The size of an RV can differ from a large 40 foot class A to a small 10 foot class B, it depends on what your looking for...
The size of RV queen mattress is 74"W x 60"D x 8"H.
Discount RV tires can be found at any Discount Tire chain store. Cheap RV tires can also be purchased from websites such as Craigslist, NexTag, Amazon and eBay.
Read the cold tire pressure on the side of the tire and set the pressure to 2-3 lbs below that number. This is more a function of the tire than the vehicle.
First, you would have to define which size RV you had in mind. RVs come in many different weight classes, ranging from a Class 2 vehicle (with a GVWR of up to 10,000 lbs.) all the way up to a Class 8 vehicles (with a GVWR in excess of 33,000 lbs)
depends on the condition and size...
Reg size sheets
It would depend on the size of the RV. Contact your local storage rental facility and ask them.
No way to answer this without more information. The chassis was most likely from another manufacturer, and Southwind built the body... you can call the chassis manufacturer with the VIN number and they should be able to tell you.
Any tire shop can still order 16.5 inch tires.
Start by having wheel balance and tire wear thoroughly checked.
An RV.