Living near Barcelona i know quite well Ebre (Ebro) battlefield. In fact I've been there a lot of times in the still standing trenches. Several years ago I did a study about this battle, the largest in the Civil War, for the school.
I could tell you that if you want to simulate the scenery of Ebre near towns like Gandesa, Corbera or Vilalba dels Arcs (major combat areas in the battle), it should be quite hilly, with intersected and quite small orchards and weat. In the top of hills always put a wood. Few houses, and grouped in big crowded villages. Near Gandesa must be more flat and with bigger weat fields. Here was a combat for a road south of Gandesa wich could be interesting for all who wants to use the 88. 9 republican T-26, with some infantry and mortar suport attacked a small nationalist hill, bombed for a few days. But at their right flank the Legion Condor deployed some (dont know exact numbers but 2 to 4)AA 88cm guns. You can imagine the result.
If I find some Ebre 1938 pics I will try to put it here to show you the kind of battlefields.
Most usual vehicles in the Sp C.W. where FA-1, BA-3, BA-6, T-26B, CV-33, Pz-Ia, FT-17, and a lot of home-made battle trucks!
Also I will find info about first T-26 battle in october 36, in SeseƱa (south Madrid). 14 T-26 assaulted 2 towns and 3 where lost without any ground gained.