Every C in the 22-25 ft length we have looked at (except Nexus) had the step .
And every place said it was for added storage in the back under the rear bed etc.
And every one that had the step had a decent size storage anywhere had an access door from at least 1-2 doors from side and or back of MH.
Nexus the floor is flat from the back to the step down into the cab. The rear storage space isn't as big. But I'd take that over no step..
If you have ever stepped off a curb and jarred your back. You will hate that step ! Also the step is in different places , so I question the "room for the rear axle/tires" at least on the ones we have looked at 22-25 Ft
One coach had the step at an angle NOT straight across.
Some put that step right at the edge where the oven/range is next to the fridge.
So if your short and want to grab something out of the fridge/freezer while your cooking or ? Its step up open fridge/freezer get whatever out, step down , step up to open fridge ,to put back in then step down..Would get old real quick!