I replaced all 3 of my hoses a couple of months ago. One of my hoses burst while i was up on the jacks and RV dropped about 8-10"... sickening feeling and AT fluid everywhere. I don't have auto leveling, so the pump did not continue to run. I think I spent about $300 for new hoses and did it myself. I would estimate maybe 3 hours total labor, so... you should be looking at maybe $400 labor + hoses + a gallon of fluid... so maybe $750 total?? It's not a difficult job, but is a messy one.
Hugh 'n Deb - USAF Retired B-52 Pilot
2004 Safari Zanzibar 40', F-150, BlueOx TowBar, SMI AF1