Not sure what vans have a garage, but our Bailey has a side door under the back bunks, we can raise the lower bunk and put bikes in but don't as it's too much trouble. We just use a bike rack. I have seen vans on site with under fixed bed store accessed from outside.
Wendy
------------- Animals are my friends... and I don't eat my friends...
George Bernard Shaw
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Our Swift Fairway 570 does (dealer special based on the charisma 570). I believe most of the swift stable vans (Abbey, Ace, Swift,Sprite etc) with 6 berths and fixed rear bunks have this facility.
Our Elddis Avante 556 has one. Most of the models with bunks across the back have a garage door, the bottom bunk then fixes upright to create the garage space. Haven't got our caravan yet so don't know how good it actually is! I do know that when looking at secondhand vans you need to make sure the garage door seals well to prevent draughts and damp. Didn't look at any other layouts which had garages, it was not esssential for us but fixed bunks are.
I found the caravan finder website useful for identifying which vans have which layout.