A "fully loaded" tourer should have:

• braze-ons for fenders, front and rear racks, front low rider rack, at least two (preferably three) bottle cages, pump peg, and possibly even braze ons for storing extra spokes
• long wheelbase to prevent heel strike against panniers bags (and for a smoother ride)
• thicker tubing than racing bikes (to handle the extra weight)
• relaxed geometry
• room for wide tires with fenders
• cantilever brakes for robust stopping power
• strong wheels (either strong double-wall box-section rims or high spoke count)
• wide-range gearing to handle any climbs with a full load

Seconding Bluesdaddy's comment abou Shoguns, Here's a picture of a 1984 Shogun 2000, a representative example of the 1980s Japanese tourers. It has most of the above attributes: