We have a Coleman 268RK and the floor plan suits us wonderfully. We have never had problems with shifting in the cabinets but we keep things secure in bins, baskets and other containers. That's something we have always done anyway. The only time we had a problem was when some impatient driver behind us thought we were the cork in the bottle and passed us, just to stop short on us when he couldn't get by the truck in front of us going slow. I had to stop rather abruptly to keep from going into his bumper.
I do make it a point to drain the kitchen grey tank before we leave any campground due to the added and unwanted weight. The trailer will pull a bit squirley if the tongue gets light. The separate kitchen grey tank requires added lengths of sewer hose to be on hand.
Find the floor plan that suits you best, then make it yours.