I find Danas and Aufs have the accuracy to be useful even in a small numbers of 2 to 4, especially for counter battery I typically only bring a few tube arty if any. Actually NATO mortar carriers are probably my most favored fire support, even though the range is relatively short they are very good at putting rounds on target even without spotting.
Make sure you don't take units, especially expensive ones, in the native platoon groups, instead pull them in a singles and then assign them a control group, otherwise they will clump together and get bushwacked by arty or a gunship.
Take advantage of kiting your tier one armor. Leo 2s, Challys, T80s, etc. have a range advantage on medium armor, by maintaining the range your top tier MBTs can chew up lesser tanks. However, make sure you husband them well though, at knife range a 50pt tank can pop your 200pt MBT.
Take armored CVs, VABs, Sultans, BRDM1s if its a Jeep CV some errant arty shot will smoke it and poof goes 200pts. Get rid of unarmored, CVs period.