I have 2 hydraulic cylinders (3"x18"). What should I make?

[LDCravey]

I have 2 hydraulic cylinders (3"x18") and MIG, TIG and Stick welders. What should I make?

 

[jjef]

Dump trailer?

 

[metalmagpie]

Be aware that it isn't trivial to synchronize two cylinders.