Mounting residential panels

Was wondering how those of you that have used and mounted residential solar panels on there travel trailer mounted them. Did you use special mounting raile or did you use the standard "z" brackets that come in kits.

I am especially wanting to know about the use of z brakcets on a residential panel. I think theye would work but given the fact that residetial panel usually are dimensionally larger and wiegh more they may create problems. Let me kn ow your thoughts and how you may have attache dwith the z bracket.