Sorry to come late to the party.
I tow a G-218 with a 2009 Tacoma. With the towing package, the Tacoma is tow-rated for 6500 lbs. As I have said in other posts, towing on the flats is okay, but towing on some of the hills around Calgary is onerous. The trailer weight is less of a factor then the wind resistance for me.
I have a Reese hitch with dual sway bars and have never had any issues with trailer sway.
In summary, I'm pretty sure you'll be able to tow the G-218, but it'll be a fair bit of work for both you and your truck.