Acotango is a fantastic Volcano located at the border between Bolivia and Chile and is part of a "three brothers" group of volcanos, including Guallatiri and Capurata. It is in the Oruro District, close to Nevado Sajama and to the twin summits Parinacota and Pomerape.
The road to the Base Camp is really hard even for an AWD: even if there are no technical difficulties to join the summit, it takes many hours walking in a very steep route, with a lot of Penitentes creating problems in the higher part.
From the village of Pueblo Sajama, it takes one hour and a half to arrive at the base camp, by driving an AWD and consiedring dry period.
In case of rain or snow, the road would be impossible to drive.
No red tape, but consider that the roads there are really difficult and sometimes impossible
Camping is possible anywhere: normally the base camp is located on an old mine village, a little bit repaired from wind, at about 4900 meters.
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Andean Summits is a professional agency located in La Paz: they can offer a well established experience in many different sectors, such as mountaineering, 4X4 tours, trekking etc. (www.andeansummits.com)
Strong wind on the summit ridge is quite common as well as very low temperatures. From 5700 meter but depending on the season, you'll find hard snow and ice, together with penitentes.