Suggest you go up and down the same way, namely on the up in short not exhausting sections so you can enjoy it and too in sections but a bit longer. The point being for the down hill run to avoid your rims becoming over heated and placing the tubes at risk of a blow out. This has not happened to me but friends have had this nasty experience.
We have mechanical disc brakes (Avid bb7) which worked well on a 30 km descent in the Alps with a fully laden tandem pulling (or in this case being pushed by) a 40kg trailer load. 200kg all up.
Take it easy. You should be fine.