RTV900 - Question on transmission and getting stuck

[billfires]

We have an RTV900 at the fire dept where I work part time. It is set up with a pump and 70 gal tank, along with a Stoke's basket and medical equipment. I have used it for EMS details and it will go 24 mph on the flat but slow to 16 mph on a mild grade on the paved roadway. Offroad in low range with the differential locked it will spin 3 of the tires. Bill C

 

[ROUSTABOUT]

Alternator.