For pretty much any map:
1. spam rocket trucks
2. make a palisade around your trucks with scorpions and annihilators
3. pull damaged tanks back and send in reserves
4. wait until just a trickle of infantry is left
5. GG
for final level: build economy while keeping back zombies with groups of 5 shovel dudes (save up 250 to build all 5 at once), once you've maxed out salvage yards get 1 trailer & send out groups of 10 shovel dudes until you can get an angry mob, support the angry mob with extra shovel dudes and farmers to get enough yeehaws for a thresher, after that use the thresher to take care of groups of giant dudes, from there tech to priest and you're done
i got one better, but im not sharing just yet.