First, I recommend you concentrate on properties that YOU find attractive as an Investor, rather than trying to work out why other Buyers might like to pay you more than you Contracted, for a property that hasn't particularly appealed to the Investor-in-you in the first place.Consequently, finding a Lender who will "cover" you by lending the money to you IF you can't track down another cash Buyer before "closing" time, becomes a win-win for both Plan A (Wholesale) and Plan B (Buy)! 

Leave them a copy of the evidence and your card.

The HELOC is a debt similar to a credit card and underwriting will look to see how much of your total credit you have accessed and how much is still available.  

Passed out cards and was offered potential work on a realtors flipper.

I like it for a few reasons.Pros:Accept payments through EFT (or credit card but I don't allow that)Online tenant portal Track all your leases and tenants easilyCommunicate with tenants through email or snail mail easilySetup late fees on a per lease basis or use a global settingCustomer service is excellentCons:The accounting module could be better

I've read on the usps website and that can mail out a index card.

I don't really care much if a person can't or doesn't want to pay their credit card or hospital bill as long as they have a good history of paying their rent.

I had also prepared to offer the occupant cash after moving out rather than have to go through the eviction process to create a sort of win-win, rather than a loose-loose (where the angry occupant is forced out and destroys the house along the way).  

Win-win. 

After this you can take out a credit card that you pay off each month.