We use Worldwide Express. They represent multiple shipping companies. While 42x48 is a standard pallet, pallets of all sizes are shipped every day. No issue. They can pickup from you and can arrange a "Liftgate" truck if you don't have a forklift.
https://wwex.com/ or 800-758-7447 (SHIP)
You need an LTL (less than a truckload) shipment.
You could also consider Forward Air. They are "Terminal to Terminal" only.