TriMark has one that is a little better than some stock "FIC" handles.
Stock# 060-0251 on Trimark web site.
I used to work for FEMA, and the FIC locks were easy to get into, especially if you had a master key(which used to be fairly easy to get). The Trimark is harder to "pick", and a master key usually will not fit the deadbolt(there were rare occasions when the master fit the deadbolt). There may be other locks out there that are better. If someone is trying to pry the door open with some sort of pry tool or large screwdriver, a standard travel trailer door is not going to fair well(I saw a lot of break-ins on abandoned and vacant units). Not trying to be negative here, but a good lock and maybe even a security system will improve odds of not getting broken into.