The X-Tension is Isabella's inflatable freestanding van room. Like the Buddy, it connects to your existing roll-out canopy's keder rail. Unlike the Buddy, it does not use the awning as its roof or structure. The X-Tension inflates into a rigid room that supports itself completely. The result is a significant practical difference: when you want to leave camp and explore, you unzip the tunnel connecting the room to your van, drive away, and the X-Tension stays standing. When you return, you reconnect. This guide covers how the X-Tension works, how it connects to your van, and how to select the correct tunnel for your build.
What the X-Tension Is
The X-Tension is a fabric room supported by internal air beams. The beams are X-shaped and run through the interior of the shell, giving the structure its name. When inflated to working pressure, the structure stands rigidly without poles or external guy-wire support under most conditions.
The room adds 90 square feet of living space to your van setup. Interior depth is 250 cm (8 ft 2 in). Three sides have removable or fold-down panels, allowing configurations from fully enclosed to an open sun canopy. The fixed rear panel, the side that faces the van, has a permanent mesh window for constant ventilation.
Integrated blinds on the panels can be rolled down for privacy or shade.
How It Connects to Your Awning
The X-Tension comprises of two parts: the free standing tent and a tunnel that is matches your van's height. The tunnel uses the same keder channel connection as the Buddy. The structure's top edge carries a keder beading that slides into the channel on your roll-out canopy cassette. Thule, Fiamma, Carefree, and Dometic roll-out canopies all carry this channel.
The Tunnel: The Key to Van Connection
The physical connection between the X-Tension and your van body is made by a separate piece called the Tunnel.
The Tunnel is a shaped fabric sleeve. One end slides into the keder rail on your roll-out canopy. The front zips onto the rear face of the X-Tension. When zipped closed, the Tunnel creates a sealed, weatherproof passageway between your van's side opening and the interior of the room.
When you want to drive away, you unzip the Tunnel from the X-Tension. The X-Tension remains standing, held by its own structure and base pegs. The Tunnel is removed from your roll-out canopy's keder channel. When you return to camp, your slide in your tunnel to your roll-out awning keder rail, re-zip the Tunnel onto the X-Tension, and the connection is re-established quickly.
This is the X-Tension's defining capability. Your campsite stays occupied. Your room stays dry. You drive freely.
Selecting the Correct Tunnel
Tunnels are specific to your van's height and profile. An incorrectly matched Tunnel will not seal correctly.
Isabella offers two Tunnel sizes for the U.S. market, covering the van platforms most common in American campervan builds.
Van Tunnel — for vehicle heights of 235 to 245 cm (approximately 7 ft 8 in to 8 ft 0 in). Fits Ford Transit, Ram ProMaster and similar full-size panel van platforms. Mounts on the keder rail in roof roll-out canopies from Thule, Fiamma, Carefree, or Dometic.
Van High Tunnel — for vehicle heights of 255 to 280 cm (approximately 8 ft 4 in to 9 ft 2 in). Designed for Mercedes Sprinter or other high-roof builds.
These two sizes cover the dominant van platforms used for campervan conversions in the U.S. market. Isabella offers additional tunnel variants for lower-profile European van formats, but those platforms are not commonly found here and would need to be special ordered through Isabella USA.
To confirm which Tunnel applies to your van, measure the total vehicle height from ground to roll-out canopy height. If you are unsure, Contact Us before ordering. Tunnel selection is the most critical variable in the X-Tension purchase.
How the Inflation System Works
The X-Tension uses a single interconnected air beam circuit. All internal tubes share one inflation path. One valve, one pump.
An Isabella Air pump is supplied with the X-Tension. Setup follows a two-stage process.
Stage one: lay the deflated structure flat on the ground in position. Inflate to 4 to 5 psi. At this pressure, the tubes fill but the structure has not yet risen. This seats the beams correctly inside the shell before full pressure is applied.
Stage two: switch the pumps smaller pump setting and continue pumping to 9 to 11 psi. As pressure builds through this range, the beams stiffen and the structure lifts from the ground. The room is standing within a few pump strokes of full pressure.
Full pump time from flat to standing is approximately 7 to 9 minutes. Do not exceed 11 psi.
Setup Sequence Overview
The full X-Tension setup from bag to occupied room follows this sequence:
Slide the Tunnel into the keder channel
Lay the X-Tension flat in position in front of the van
Inflate to 4 to 5 psi (Stage 1), then continue to 9 to 11 psi (Stage 2)
Zip the Tunnel onto the rear face of the X-Tension
Pull the X-Tension away from your van to create a taught tunnel
Peg the front X-Tension corners to hold it in place
Start from the closest point to the van and start pegging towards the front
Total setup time from bag to sealed room is approximately 15 to 20 minutes for a practiced user.
Driving Away and Returning
When you want to leave camp:
Unzip the Tunnel from the X-Tension rear panel
Slide the tunnel out from your roll-out awning
Drive away — the X-Tension remains standing and pegged
When you return:
Park in the same position
Slide the Tunnel back into your roll-out awning
Zip the Tunnel back onto the X-Tension rear panel
Check that base pegs are still secure
In sustained wind above 20 mph, stake the guy ropes before you leave. In forecast of strong storms, pack the room down rather than leaving it standing.
Packing Down
Deflation is quick. Open the valve and the structure collapses in 2 to 3 minutes. Both valves can be opened simultaneously to speed the process.
Fold from one end toward the other, rolling or accordion-folding to expel remaining air. The packed X-Tension fits into a large bag.
The Tunnel slides out of the keder channel and folds separately.
Materials
The X-Tension outer shell is a technical coated fabric designed for inflatable construction. The internal air beams are TPU (thermoplastic polyurethane) bladders inside fabric sleeves. TPU is UV-resistant and maintains pressure well across temperature ranges.
The windows are clear PVC panels.
TPU air beams can be repaired if punctured. Isabella supplies patch kits if needed, however with proper care and handling, we have seen very few issues in the thousands we have sold in Europe.
Check out the X-Tension here.
