Storage Lockers in Kampala or Jinga

All,

I am an American looking to retire in Uganda in 2019.  I wish to bring some of my belongings with me for storage somewhere between Kampala and Jinga for up to two years.

Considerations:
1) I need a space of about 125 cubic feet (for example, 5ft x 5ft x 5ft)
2) The space should be secure
3) The space should be dry

Any help in locating such a facility would be appreciated.

Thanks,
Jed