How Private Sale Loans Work
Buying from a private seller can save money, and many lenders will finance it. They'll want the sale details, the trailer's VIN or serial number, the seller's ID and rego papers, and a clean PPSR search. Some will want photos or an inspection.
The lender usually pays the seller directly. If the seller still owes money on the trailer, the old loan is paid out at settlement from the purchase price, which protects you.
Never pay a deposit on a trailer you haven't seen. See buying on Marketplace or Gumtree.