Howdy - as mentioned, you need to know what the manufacturer says it can tow, not what the hitch is rated for... Quick search seems to indicate your rig (unsure of year...) has a 5K towing capacity. We tow our 3200# Forester with our Sprinter-based Prism (we have a 3500# limit) without difficulty. Been across the Rockies, toured West Virginia hills, live in NH White Mountains. About 25K miles towing so far. make sure you have a supplemental braking system - we use ReadyBrute and have been very happy with it.
Two and a hound in a 2015 Coachmen Prism "B+"...pushed by '09 Suby Forester
First 50 done, working on the second pass! Nunavut - we'll see...!
2005-2015 Roadtrek 190P
1993-2005 Northstar Soft-Side TC
1989-1993 Backpacks & Tents!
1967-1977 Family TT's