Nice Santana...I was curious how tight a tandem would fit with a rear topper.
So far I have gone the easy route, but don't deal with the topper. Two Bike Tights fastened to the front rail. Carries our singles easily, and works ok for the road and one of our mountain tandems with the tailgate down and bed extender.
The second mountain tandem with the 20mm front axle gets tied down into the corner like a dirt bike.
Luckily we have a full size long Ford Van setup to carry motocross bikes with a partition/wall behind the second row of seats. This works best for all of our tandem adventures with any traveling.
Nice setup you built though. Good solution to one of the issues we all contend with owning a tandem.
Before I bought the truck I measured dozens of times to see if I could just back it in at an angle and everything said yes.
When I got the shell I did not take into account the sloping angle of the back hatch.
Could make it fit by turning the bars to full lock but did not like that method so my slider idea was born using the material I'm most used to wood.