Welcome to the forum Rick!
Using the GVWR of the little trailer (2,900) is a good start.
If you load that trailer to the max, and figure 12% tongue weight, you would just fit the 350 lb max available. IMO 10% tongue wt is absolute minimum, but more than 12% not necessary.
I don't know the dimensions of the Little Guy trailer, but your Subaru manual should give a trailer towing frontal area allowed. A flat bed trailer weighing 3,500 would tow much easier than an 8x8 frontal travel trailer weighing 2,900.
Towing long distance, or just more close to home? Towing flat country, or up/down in the mts?
Being a new vehicle, will help, but over time, may take it's toll. If you give it a try, and you feel you don't have enough tow vehicle, can you afford to take the hit, and trade for a different new vehicle?
Those are my thoughts, but only you can decide.
Good luck,
Jerry