Yes... I use the 5 x 9 every week excepting holiday for a 22 mile landscape loop through all the rental properties... I bought the trailer used in 1985 and still have the same tires...
Tires are 10-ply tube type and 16"... the rims came from a 1950's era Chevrolet Pick up...
The yard trailer which is street legal has a very old set of AG tires... also 16" with tubes... speed limit 45
I know that tube tires are dinosaurs but most of my cars and trailers have tubes and find them exceptional... especially with 6-ply or better old fashioned made in USA... I believe the oldest are US Royal followed by Goodrich... the AG are Goodyear.
The only trailer I have had tire issues are my newest radial tires on the 18' enclosed trailer... they will loose pressure in in months where as the tube tires loose almost nothing... I have had to replace 2 in less than 5 years and total miles less than 2500.
All trailers are outside... exposed to weather.
The oldest set of tires I bought are Montgomery Wards Allstate Brand Nylon tires... bought them new in 1973 for my 1929 Model A Ford... 45 years old, garaged and not a single crack or check...
With 50 vehicles it would be financially not feasible to replace tires based on an arbitrary 5 year span... simply couldn't do it not to mention the environmental toll...