I see you are from Canada, I have friends in Canada with this model, so they are up there. If you find one on good shape and well loved, you found a gem.
Sunline T-2499, Non Slide, 7,000# GVWR, Dry weight, just under 4,800# GVW, length 25' 11"
A few pics,
If you want more pics, see my Flicker page here. We sold our 2004 but I later bought a 2007 I'm restoring.
Sunline T2499 on FlickerThe pics you see are maple interior. The 2007's had a cheery option if you are after the darker woods.
You can find this model from 2003 to 2007. I would not rule out the 2003's or a 2004's. 2007 models will be the last year they were in business. Sunline built a quality camper. And with any camper, the owner needs to take care of it so make sure you check for signs of water intrusion in any used camper.
Sunline made other rear living floor plans, however the camper is longer and heavier needing a 3/4 or 1 ton truck to tow. I left them out, but if interested I have more on them.
A note to understand, rear living campers can have high loaded tongue weight due to the floor plan. They load with more weight to the front. Those 2 nice swivel rocker chairs in the back looking out the big window do not offset all the cargo stored ahead of it. This is a trait generally regardless of brand. Make sure your truck and bed load is capable of handling the floor plan.
Good luck in your search.
John
2005 Ford F350 Super Duty, 4x4; 6.8L V10 with 4.10 RA, 21,000 GCWR, 11,000 GVWR, upgraded 2 1/2" Towbeast Receiver. Hitched with a 1,700# Reese HP WD, HP Dual Cam to a 2004 Sunline Solaris T310R travel trailer.