Well, you do know that 5er's have 2 sets of steps don't you? The steps from the ground to the main floor of the camper, and then the steps from the main floor to the upper floor. Depending upon size and height of the camper, you could be having to climb as many as 10 steps. If you are getting older (which we all are), you might REALLY want to rethink this a moment or two. Not knowing your age, will you be able to still comfortably climb steps in 10 years (assuming you keep the camper that long and still using it).
This is one of the main reason why we stayed with a "single level" camper all these year. And now that I've just had 4 really bad years with bad knees, and then finally knee replacement this last Summer, the choice for less steps was a very RIGHT one (for us) anyway.
Hey, it's just something to "think" about seriously before making the switch! Older age and steps don't mix very well.
Now that the knee doesn't have the pain any more, just stiffness, those steps are much more friendly now.