Basic, High-Tech, maybe Low-Tech: different tents / tent types

[vicky_molokh]

Greetings, all!

I'm making a loadout for a carry-everything-you-own character, and am looking at the options of tents. TL is 6ish, but I want to have a clearer picture of tents in general.
B288 lists several tents, including
Tent, 1-Man (TL0). Includes ropes; no poles needed. $50, 5 lbs.
Tent, 2-Man (TL0). Includes ropes; requires one 6-foot pole. $80, 12 lbs.
High-Tech 56-57 lists
Tent, Shelter Half (TL5). The standard U.S. Army tent from the Civil War through the 1980s, this is a small “pup” tent – so called because it’s barely big enough for a dog! It consists of two separate sheets of treated canvas, the “shelter halves.” Weight includes poles and rope, which are split between two soldiers. Survival modifier: +1. $75, 10 lbs. LC4.

I'm trying to figure out precisely what each entry represents. From what I read of shelter-half, it's not as small as the HT description implies, and is also typically suitable as a poncho too, which is why it's called raincoat-tent in some places (sometimes even hooded, I heard).
The 1-man tent looks quite attractive compared to the shelter-half, but I don't get what sort of design it is that it doesn't require poles.
Also, I wonder what is it with the 2-man tent that its mass is 12 lbs instead of a mere 10, and it requires a pole whole two yards tall.

Thanks in advance!