Depending on how your Sierra is configured, your towing capacity is rated between 4,400 to 9,600 lbs. So be sure to check the printed sticker on the drivers door for your specific set up option.
The weight info for your t/t is below:
Dry Weight (lbs/kg) 5750 / 2608.2
Payload Capacity (lbs/kgs) 1952 / 885.4
GVWR (lbs/kgs) 7740 / 3510.9
1/2 ton towing a 26 footer reasonably loaded should be OK, but I would take into account what type of area you'll be traveling in. For us, we find most of our traveling includes mountains and passes that taxed our 1/2 ton a little more that we wanted even though we were within the towing and GVW limits.
After checking the actual numbers for your Sierra and verifying you'll be within the towing and GVW limits, see how you feel once you get your outfit on the road. If you like it use it a lot and enjoy it often
FR Wildwood 22 RKS
2007 1/2 Dodge 2500, Cummins 6.7
Retirement training completed
Currently enjoying second childhood