Porters' working conditions in Kilimanjaro

Hi,

I´m planing to go to climb Kilimanjaro and, as fas as I know, it is
only possible to be done with an guided group, there are no permits
for people in their own. Is this true?

My main worry is how these groups treat the porters. I´ve seen
trekking groups in Peru (Inca trail to Macchu Picchu) where the
porters worked in very very poor conditions: no rucksack, lot of
weight hanging with ropes form their necks and heads, carrying lots of
unnecesary weigths as big butan bottles, tables, chairs, etc.

Is this the same in Kilimanjaro or is it posible to find a group where
the porters are treated as persons? Any recomendation?

Thanks in advance.

Antuan