The concepts in the 2nd image look like the C-141 and C-5 airlifters. The distributed load airplane design was envisaged by Boeing and would have hauled bulk shipments of minerals and oil (see Gunston's Big Wings for illustration on page 313), while the distributed load plane in the fourth photo reminds me of a spanloader design illustrated on page 312 of Bill Gunston's Big Wings book.
When compared to the Boeing 747 and Airbus A380, these freighter plane concepts were monsters in both cargo load and wingspan.