[Baz]

32' foot ladder = 16' ladder when not extended?

If so....6' bed minus 16' ladder = 10' sticking out back?

No bueno.

You don't want to do it - but you should lay it over top of cab with base in bed against tailgate.

Wrap ladder with towels/blanket and bungee or duct tape to secure where it rubs on cab. Then strap down with ratchet straps.

Done!