I have been doing it once a year since ownership (3 times). I cut the mount for the wiring harness a bit so that I can slide it out a bit easier (still a PITA). I suppose it is a little over 15K each time. They have been clear so far but I worry about tank delam. so I am sure to do it each year.
E-350 Super Duty Chateau 6.0 PSD 133,000 miles (Wiring harness relaced (under warrantee), FICM replaced, Alternator, Ball Joints, Motorcraft Batteries (3rd set), Radiator, Tank Delamination and pump, 3 glow plugs, stabilizer bar ...)
2007 Chevy Express Explorer
1999 Chevy Express Mark III
2002 Forest River Shamrock 25BH