"White Man's Burden" got a new pop-top canvas and lived up to its name:

http://gallery.openfbo.com/PopTopCanvas

My recommendations if you get a new canvas:

1.  Take the damned pop-top off the camper and screw in four screws per
corner.  The corners are the tightest part of the canvas.  I tried to save
time and effort by installing the canvas with the pop-top still on the
camper.  HUGE mistake.  Wasted a good 10 hours altogether.  Once I got
the pop top off, it was a 5 hour job.

2.  With the top corners holding the canvas to the pop-top, put the
pop-top back on the camper.

3.  Screw in the middle of each bottom side.  The bottom of the canvas has
a rubber strip that butts up against the metal tacking strips.  Work your
way out to the corners stretching the canvas out a little bit at a time.

4.  Screw in the rest of the top of the canvas, taking up slack in the
fabric.  My canvas has several inches of slack at the top:

http://gallery.openfbo.com/PopTopCanvas/img_3898

5.  Find a local supplier for the screws and pop-top attachment nuts.
Those screws get stripped or lost in the grass easily.

I sure am happy with it, now that its done.  The breeze through the three
windows is great during these hot summer days.

Cheers,
Matt