As the seller, I only accept certain payment (cleared check, or money order, etc.) and shipping terms of FOB (Free on Board) - in which the buyer’s shipper picks up the item, the buyer pays for shipping directly to the shipper, and risk of loss during shipment is the buyer’s risk to file claims with the shipper. Or, the buyer can pick up the item personally.
The buyer is free to choose the shipper the buyer prefers (UPS, FedEx, or freight shipper, etc.).
"UPS Pack & Ship" appears to be a good alternative for shipment to assure good insurance coverage and minimal potential for difficulties in settlement of claims.
I take plenty of pics of the item, the packaging and the packing process to provide to the buyer to support any claims.
The buyer is in control of the shipment and the risks, and determines the shipper in which he has the greatest confidence, who honors their insurance, which may be a freight shipper.
That is the best way to avoid conflicts.