We wish to set up a Dealer Network for our Material Handling Equipment and wish for a perfect cover letter for prospective dealers..

I don't understand your question. Are you asking us to write one for you, or do you want sources that can explain how to do this properly?

If you are asking us to write it for you, it would not be exactly appropriate to for so as we know nothing about your company.

We can provide websites whereby this is explained to you so that you can put together a cover letter.