Bison61 Annex Room

The Bison61 Annex Room is a full ground-level room that attaches beneath the flagship Bison61 rooftop tent and turns the rig into a genuine two-storey basecamp. It encloses the space under the sleeping platform with waterproof fabric and ventilation windows, so the area your vehicle and tent already occupy becomes a second, weather-protected room rather than open, exposed ground. Upstairs you sleep; downstairs you stand, change, store gear and shelter.

It solves the problem that scales with trip length. A rooftop tent is an excellent bed, but on its own it leaves you with nowhere to be at camp except up the ladder or out in the open. For a single night that is fine. Across the kind of long, committed expeditions the Bison61 is built for, the want of a sheltered ground space — somewhere to pull off wet or dusty layers, keep boots and kit out of the weather, and simply sit out of the wind — is exactly what makes long trips harder than they should be. The annex gives the flagship the downstairs room a basecamp needs.

Across Indian terrain that room does real work. In Ladakh and Spiti it is a wind-break and a cold-weather changing space where you deal with boots and layers out of the wind. In the Rann and the western deserts it is shade and a shield against blowing dust and salt. In a Himalayan-pass storm or a Western Ghats monsoon it is a dry threshold and a dry store, a place to step into and keep gear before climbing into the tent. For a larger rig set up to live out of for days at a time, it becomes the most-used part of camp.

Setup follows the same logic as the rest of an expedition rig — it should go up without a fight. The annex fastens to the underside of the deployed Bison61 and walls the area in down to the ground, and the design aims to let you rig it without threading a separate pole kit or roping in a second person. The ventilation windows let you tune airflow from inside: open them on a warm evening to keep the room fresh, close them down when the wind turns or dust blows. Because it lives in the tent's footprint, you are not hunting for a second patch of level, stone-free ground to stake out a separate shelter.

Care is the same discipline that keeps any serious expedition fabric going. Dry it fully before it is packed away — storing waterproof fabric damp is the quickest path to mildew and a smell that lingers. Brush sand, dust and salt off after desert and coastal runs, sponge mud off rather than grinding it in, keep zips and contact points clear of grit, and store it loosely somewhere cool and dry between expeditions. Done consistently, this keeps it waterproof and dependable trip after trip.

Compatibility is matched to the flagship. The annex is cut to pair with the Bison61 rooftop tent specifically, so it fits that tent properly rather than being a loose, universal shelter. The Bison61 is the flagship of the range and suits larger 4x4s and SUVs, so in practice the annex is for owners running a Bison61 on rigs such as the Fortuner, Hilux, Scorpio-N, Defender and similar full-size platforms. If you already run a Bison61, this is the room that goes under it; confirm your tent model before ordering so the fit is right.

It is built for the overlander running the flagship on long-haul, multi-day expeditions, where standing room, privacy and a sheltered place to manage kit are part of camping well rather than luxuries. Couples and families travelling together get the most from it, as do crews spending many consecutive nights out. If your trips are mostly a single fair-weather night, the tent alone may be plenty; if you are building a Bison61 rig to live out of, the annex is what turns it into a two-storey basecamp.