nose upper cabinet

Hi Folks
Doing the kitchen up in the front of my 6x12 vnose. My question is how do you support the upper cabinets from sagging, or for that matter collapsing during travel. My trailer is 5"9" wide and it seems like I should have a vertical strut in the middle to support the upper cabinet. But if I can avoid that middle strut would prefer
Cheers
Al
Doing the kitchen up in the front of my 6x12 vnose. My question is how do you support the upper cabinets from sagging, or for that matter collapsing during travel. My trailer is 5"9" wide and it seems like I should have a vertical strut in the middle to support the upper cabinet. But if I can avoid that middle strut would prefer
Cheers
Al