STOP and think about this before you knee-jerkers give a "+1". You guys are asking for the 88mm to be towed. Ok, so you spawn in towards an enemy field and set this thing up somewhere in between spawn and town of the field. Remember, the **minimum** range is 1500 yards and the traverse rate is slower than a 7 years itch. Enemy aircraft, be it IL-2, Storch, or A20 is going to up and investigate what is making the base blink. They wont see the towed 88mm until 625 yards out, but will be inside the 1500 yard "safe zone" long before. Point being is that the value of a towed 88mm in AH will NOT be anywhere near the value of the 88mm in the real deal.
The Osty, Wirby, and M16 are far better for close AA than the 88mm. Hands down. The 88mm will decimate bombers and other aircraft flying in to a base. Leave it at that.
AH is a long way from adding in "towed" guns. IMO, AH would be far better served by adding in self propelled guns like the Wespe, Priest, Su-122/152, (Su-100 = TD), etc etc.