I have an account that is in good standing and it is only being reported by Experian is it possible to request that Equifax and TransUnion report this account as well?
What chance if any do I stand if I sent the other two credit bureaus proof of payment history in regards to my account being in good standing? Do you think there is a chance I can get them to report the account and add yet another positive credit history to my cr or is that solely up to the creditor to do?
It's up to the creditor to report. Bureaus won't report a history based on something you send them. Some creditors only report to one bureau. I've found this especially true with smaller lenders like credit unions.
That is the main reason credit scores vary so significantly between the CRAs - not all creditors reporting to all three, some to only one, some to two. My car loan, for example is only reported to/on Experian. Your example - credit union is right - i have my car loan through one, and they report only to Experian.
Call the creditor and see if the will report it. They may charge you a fee assuming they are receptive at all.
You need to understand that it does cost money for a creditor to report. Smaller businesses often only report to one bureau to save money. You cal always ask if they will report, but be prepared to either pay a service fee or be told that they cannot report to the other bureaus. It's nothing against you, it is only business.