Just ordered this as our RTT choice. We researched many tents and price points and decided on our limited usage, this will fit the bill. The annex is not available on their website yet, but I inquired and they have one available and on backorder for us. I'll try to keep this post updated once I receive the tent (early February) and the annex (March/ April).
18019933 OVS TMBK 3 Person Roof Top Tent with Green Rain Fly
Overland Vehicle Systems offers a complete line of high quality roof top tents from 2 person, 3 person & 4 person tent. Hard Sided Roof Top Tents or Soft Sided Roof Top Tents
overlandvehiclesystems.com