here are so tips i got:
1.Try not to make your car's front to high cause it can result in a wheelie and make you turn upside down.
2.When in air DO NOT USE NITRO or you will lose control.
3. Do not make your car look like a monster truck with weak suspension in a bumpy course you will lose control.
4.Make your car a low rider with weak suspension.[NOTE: sometimes your car will lose control.
5.[this one is only for people who fully upgraded your car]Try to make your car have huge tires and make you springs setting 0 it will help in bumpy places.
6 and last.If you want to make your car a "Monster truck" make the back of your car a bit taller than the front. pls + this if it helped so other people can see it
if you want to jump over a wall but your useing a tank or a missile truck just constantly press up while your next to the wall + this up if this helped you
there is a bug in this game its when u build a radio tower and u want put on what u want the tower to email u when u press "save settings" a window pops up and says "opps we have loged a problem" + this up if this happened to u
 "DuckLife 4"){kind=icon}
 "Mardi Gras Mayhem"){kind=icon}
 "Rod Hots Hot Rod Racing"){kind=icon}
 "Just for chatting!"){kind=icon}
 "Offroaders"){kind=icon}
 "City Siege 3: Jungle Siege"){kind=icon}
 "300 miles to Pigsland"){kind=icon}
 "Boxhead the Christmas Nightmare"){kind=icon}
 "Flight"){kind=icon}
 "Fantasy Online"){kind=icon}
 "The Soul Driver"){kind=icon}
 "City Siege 2"){kind=icon}
 "Backyard Monsters (removed)"){kind=icon}
 "Mushroom Madness 3"){kind=icon}
 "Vehicles 2"){kind=icon}
thank you :)