In Homer the Greeks don't live in tents, the Greek camp is composed of κλισίαι, which don't appear to be pitched tents but are instead some kind of constructed wood (or perhaps earth) huts. They are quite large, Agamemnon's even has several rooms, and they are destroyed when the Greeks leave Troy rather than simply taken down as a tent would be. What precisely is being described in Homer we do not know. In later Greek κλισία describes a couch or a bed, and whatever these things were they were not used--or at least not called the same thing--in the historical period. It is important to note that even if there was a historical Trojan War whatever Homer tells us about it cannot be used to reconstruct it. The Homeric Poems are works of epic fiction in the oral poetic tradition, passed down for generations. While they certainly preserve traces of a pre-Dark Age stratum, perhaps going back thousands of years in some rare cases, it is nearly impossible to separate most of those traces from the rest of the material. The identification of e.g. the boar's-tusk helmet by comparing a chance material remain with the Homeric description of an item the poet obviously does not understand are rather rare, and Homeric society probably resembles the poet's own Dark Age/early Archaic Period society as much as anything else. Nor should we necessarily think that the poet actually thinks that encamped armies would construct such huts, at siege or at any other time. These elaborate, kingly dwellings are poetically convenient for the poet, allowing him to convene large aristocratic assemblies and include the stock feasting scenes of every good contemporary epic. Whether they represent any reality at all is suspect, these are worlds most akin to the historically mixed lands of fairy tale