When something absolutely has to be done and cannot be put off, use the adjective imperative. Imperative is from Latin imperare to command, and its original use was for a verb form expressing a command: Do it! is an imperative sentence. It's still used that way, but it's more commonly applied to something so pressing it cannot be put off: Hiring new workers has become imperative..
1 A tandem (dual) axle utility trailer starts at $1,200-$3,000 depending on size and weight capacity, and it can cost $4,000-$7,500 or more for commercial-quality utility trailers.
The cost to purchase a trailer is almost always higher than the cost to rent, even for contracts that will last several years. Buying a new office trailer that is 60 feet long and 12 wide is between $28,000 and $30,000. Renting that same trailer may only be $250* dollars per month, or $3,000 a year. You would need to rent a trailer for at least 9 years before purchasing would be a cost equivalent option.