Some type info below from an earlier thread on them.
The Rochev can have either the older pop-up sight, or later armored sight cover with glass depending on which version of M109 (A1, A2, or A3) that it was updated from. The M109 - M109A1 had the pop-up sight, A2 and newer had the armored sight. Like just about all IDF vehicles, they have been updated many times from different starting points, so you will see different variations on them.
The Doher is updated with these external visual differences:
- Two sub machine guns on the Doher’s turret, only one in the Rochev. The additional SMG is positioned near the sight ballistic shield.
- Electrical travel lock (known in Hebrew as “BiFoot”) – in the Rochev one of the crewmen has to lock manually the barrel, most of the time the driver, with the assistance of the sight operator. In the Doher the crewmen can do it automatically, by electrical operation. The Doher’s travel lock is thicker than the Rochev’s, and has a rectangle box in its front side.
- External Generator – the Doher is equipped with an external generator, positioned instead of the right-back basket and its two external cells. Due to the lack of one basket, the left basket is a bit bigger (to contain the camouflage cover).
- Different shape of the commander’s turret – the Doher’s NCO turret can be locked in slit position, a position that does not exist in the Rochev.
Earlier post with lots of info and pics.
AFV Club M109 Rochev - Armor/AFV / Modern - KitMaker Network