Why do you need a handle? You have to pull back the latch with a finger and that is all you need to pull the door open.
OTOH, on my trailer, I have a short piece of cord running from the left side of the opening with a loop around the finger pull. I used a crimp-on electrical terminal for the loop. Simply pull down on the cord to unlatch the door. The cord then serves to pull the door open.
John W. Irwin
2005 Classic 28 "Sabre-Dog III"
2013 Silverado 2500HD Duramax/Allison LTZ
WBCCI #9632, TAC TX-10