I know I need to build a scale model. It may convince me that no extension is doable. I get back to my shop next month.
No argument that its a long ways back there from the drivers seat with even move wag, but...
When I see things like this quite often, hanging off the back of RVs
https://letsgoaero.com/blackbox-slid...losed-carrier/
It seems that +32" suspended a foot from the RV..(=44") is an exceptable extension... attach it high enough to provide the 10-degree SAE 'departure' angle. I'm just putting on a "roof" the shape of The Holy Template.