a more involved option if you know how to weld and fabricate steel, would be to move the jack on the trailer back a couple inches, but that would require a lot of work. especially if there is a lot of stuff up near the jack.
what kind of trailer is it? is it a flatbed toyhauler, Camper, enclosed trailer? Does it have batteries, propane tanks, or spare tire up front? and how heavy is the trailer?
if its a light trailer they make jacks that mount onto the side of the frame of the trailer that swivel. i did this option to my small pop up camper and it worked great. but if its a bigger camper then probably wouldn't be possible due to the weight.
another option is to get an after market tailgate like the fifth wheel trucks have with a bump out removed in the middle. or get an after market tailgate that is light weight and removable, like the aluminum cage style ones.
Or you could get a lift, and raise the truck up farther than the trailer and get a ladder.
hope some of these options help.