Recently purchased a reasonably expensive carbon road bike from Qld via Gumtree and had it sent via courier to WA. I spoke with the seller on the phone and he supplied a lot (I mean this seller went above and beyond) of photos of the bike. He obtained a quote for freight, had the bike packed at a bike store, supplied his bank details, and I agreed to purchase and transferred the money into his account. If anything went tits up, I had his contact details, a bank account number, a copy of the freight invoice and tracking number, and a copy of the original ad saved off Gumtree.
I did all this whilst working overseas and the guy organised for the bike to be held at the freight depot until I was able to collect in person. I had to produce photo ID to collect the bike box and I let the seller know I was happy with the purchase once I had it tuned.
This transaction consisted of about 21 emails and 5 phonecalls. Seller was so easy to deal with and wanted a sale so supplied a lot of information about the bike.
EDIT: The seller ended up using PEP transport and the cost of road freight which took about 12 days (I think) from Qld to WA was only $120.00 which seems pretty affordable. The bike arrived in 'as new' condition as the original ad stipulated so the courier company obeyed the FRAGILE stickers plastered over the box