Sounds like a Mamiya C-Series, C3, C33, C330, C2, C22, C220...
It always has a bellows included and there is a 180mm and 250mm telephoto lens available.
They are discontinued but you can still buy those Mamiyas used on eBay and used-camera-markets. The film, 120'er (and 220'er too), is still available.
As far as I know there are no similar or better twin lens reflex cameras with interchangable lenses but the Mamiya C-Series.
You can decide. C-series or fixed twin-lens or changable single-lense.