This is manageable when following a guide, but if you are trying to do this without one it is quite difficult. Below is a screenshot of each level on the first island. Remember, you may need to run the sim more than once as you rely on the bridge crashing on most of these builds. A good way to make sure that your bridge is identical to the one that I made is by checking the budget, if they are the same you most likely built it correctly. If you're having issues, run the sim a few times, you get a different result each time. If you come up with a more efficient or effective way to beat a level, let me know in the comments and I will replace my picture with yours!
Level 1-4 (Thanks to Throni360 for an easier solution for this level)
Level 1-5 (Same as above)
Level 1-7 (Takes a few tries)
Level 1-8 (Left side of bridge will collapse which will catapult the tanker to the right, will take a few tries but it works)
Congrats on your achievement! Please let me know if you come up with a better solution for any level!