getting up several times during the night is not necessarily the onset of diabetes.. it could be a sign of prostrate problems. in any event, a trip to the doctor will help in diagnosing a problem.
A Thetford portable camping toilet is what I will use in my cab. Fits nicely behind passenger seat. http://www.thetford.com/HOME/PRODUCTS/PortableToilets/PortaPotti465/tabid/166/Default.aspx These don't smell and are easy to empty...