As a fellow writer commented, porters for your gorilla safaris are essential. This encourages local employment and money back into the local community.
When I was looking at this I found World Primate Safaris as a specialist gorilla safari operator who seemed very good with excellent local knowledge. They are the sister company of World Big Cat Safaris and once again seem to know their stuff.
Gorilla Safaris - www.worldprimatesafaris.com/destinations/rwanda/main-attractions/
World Primate Safaris - www.worldprimatesafaris.com
Updates
Mountain gorillas are so endangered to the extent that they need your support. Every gorilla permit costs USD 500 and part of that money goes to the conservation efforts. I used AA Safaris and tour, www.adventureugandasafari.com
Is this your business?