Have you seen one in person? It sounds like you need to look through several of the different floor plans. Do not have a bike rack, so can not really speak on that, but from the pics, it looks like it fits on the HW256G with the front trunk space. Not sure how it fits on the other models. And a roof top bike rack - oh my - I would never be able to get the bikes up that high.
Storage experience, I find the storage pretty good in my HW 277 and that is with a 14 foot box as compared to the 16 foot box of the HW296. We fit quite a bit of stuff in it (make me wonder about my weights). Chairs, roll up table, cords, and the tire chocks all fit in the dinette seats with outside access. The bathroom can hold a large bin, the hanging pantry/wardrobes, fold up clothes rack and a three step ladder. The floor space in front of the bathroom fits a external waste water tank like a blue boy and a narrow folding table and a fold up canopy/screen room. Under the dinette table, the grill and water hoses fit. The floor in front of the door can hold several bins or the cooler. Under the stove, we have a milk crate that holds the pots and pans. There is also some storage under the sink, and the drawers are adequate - though there are only two of them. One thing to consider, the location of the fridge - and access to it when the camper is closed up - that is one item that made us pick the 277 -it is easy to turn on and fill up when the camper is closed so I do not always need to bring a cooler. With all that, we still have stuff in the car - (after all we are a bunch of gals
One of the biggest space things when in use is getting the hanging pantry and wardrobe. We got two of the wardrobes - and put one in the bathroom as we use the bathroom as a closet. That way,there is a wardrobe for the front bunk and one for the back. And I absolutely love the amount of counter space we have.
My dollars worth
HTT: "EscapeII" 2016 Shamrock 23WS (current)
PUP: "Escape" 2010 Rockwood HW 277 (gone)
TV: "Bruce" 2011 Dodge Durango V8 Hemi Crew
Just us gals (me, Sis and our daughters)
Traveled 19520 miles and 209 nights in 7 years and counting