Allen -
We have a similar rig (2720SL behind an 02 Explorer), and have the same results. Once the TM is set up, the Explorer's backglass can open about halfway. We can get a few small things in and out, but a full sized suitcase, for example, is tough. So we try to take out whatever we will need before we open the front shell.
Note that you can lower the front of the TM an inch or two by dropping the springbar latches. You don't have to remove the springbars from their sockets - you don't even have to take the chains off the hooks. So hookup in the morning is still fast. If you need another inch, crank up the rear jacks a bit.
Bill