I put Banks headers on my '97 F53 and don't recall anything prohibiting access to all the bolts and I didn't have access to a full mechanic's toolset. Maybe someone else will chime in on that. I raised one side of the RV at a time with its jacks and used a combination of jack stands and 6x6" wood blocks before crawling under it. I removed each front wheel to gain better access from the sides.
--2005 F350 Superduty Crewcab, 6.0, 4wd, short bed, 3.73 gears
--2016 Montana 3711FL, 40'
--SOLD 2014 Wildcat 327CK, 38'