Welcome to the forum. What is a Tentbox side awning?

Colin

Gavin, you have three choices that Eriba owners use.
- A bolt it or stick it to the roof wind out Thule at about £1300. Rose Awnings in Dorset are the best for this. It will still allow you to fit an enclosed awning if you want. You can also add side and front panel to this, but I've always thought it a bit of a compromise.
- A Fiamma Caravanstore at 3.1m if you plan this to be your only fitment as it slides into the awning rail and can be left on when travelling. £400 new, but good used available at 1/2 that price. This will infringe on the door slightly.
- Isabella shadow 3.6m. Slides into the rail in seconds, great for sun protection and surprisingly good in the rain. A really good used is about £120/150.
You can add end panels to the Fiamma and Isabella for a bit of extra protection. Last year I sourced a couple and did not bother using our small air awning.
Have a look here:- Comfortz Leisure Sun Shade Side Panels

Colin