The publication described above is more or less correct, and is in agreement from FAA sources.
Great care needs to be taken when approaching an upsloping runway.
Many years ago was dispatched (with a Fairchild FH227B) to a dirt runway at Cabo San Lucus, BahaSur, Mexico (quite a well known resort now, with a rather large paved runway) and the upslope was 7%...just a tad steep.
Land up hill, takeoff down hill was the procedure.
A very preculiar optical illusion, especially at dusk with flare pots for lighting.
Marlin was tasty tho....
