Depending if said mobile home was surrendered to DMV and now is an improvement on land and not movable. 

unless you have great credit and are an  experienced real estate investor, no lender will allow a owner second as substitute for borrower contributed capital.2.

Local community banks and credit unions are probably your best bet.

This can include past taxes, bank statements, credit reports etc.Stay away from anyone who says they can finance anyone from 5k-50 mil for 4% as well as anyone who asks for upfront fees.  

To pay off all our bills, and pay off what we owe on cars, credit cards, student loans, debt collectors, etc we would need around $125,000.  

Seed doesn't actually finance the deal, they just open up credit cards for you.

I've read some people are accepting debit or credit cards but this seems risky as well since they can call their bank to dispute the charge.

So I have been mostly using my brokerage account to buy properties as my credit line.  

I am about to start the process of shopping for conventional loan rates and getting pre-approved, but am concerned if I shop too much within a short time period it will adversely affect my credit score.Does every loan inquiry during the shopping process negatively affect your credit or is there a "grace" period after the first inquiry?

I'm independent, no debt, no student loans, very low tuition (with financial aid grants), rent of $500 per month, credit score above 750 and a small chunk of change saved up in the amount of $15,000.