If you are not using your credit lines, there is no reason for vendors or lenders to increase your credit lines.
For all business owners. If you are using the credit lines you have and are paying them on-time, be sure to continuously ask for credit line increases. This is how you go from $5,000 to $10,000 to $25,000 or higher. Lenders love people that use their credit AND make aggressive payments on those lines.
This goes for the business vendors you make frequent purchases from too. Every 6-months call and ask for a credit line increase. Do the same for all your personal and business credit cards too. Continue increasing your credit lines every chance you get.
Get credit when you can, before you need it ASAP!