Welcome to my world. I load my bike into the back of my pick-up! Even
tho I have a really good ramp with a built in upward bow in the center- my
bike still rubs right at the top end just when the front wheel is on the
tail gate and the rear is still on the ramp. Once I caught a bolt head on
the bottom of the bike frame on the top edge of the ramp. I was traveling
pretty fast and it stopped me instantly. So hard was the hit that I bent the
hinge sockets in my tail gate
Lucky I didn't fall over
I have to find a shallow ditch to put the rear wheels of my truck in or find
a low hill or berm to put the front wheels on so the angle between
the truck bed and ramp aren't so extreme.
You may need to do something similar. Jacking the trailer tongue all the
way up isn't so bad. Maybe it's time to invest in a power tongue jack??