[VAC] propane tanks

["Alec Fisken" <afisken@xxxxxxxxx>]

I have a few questions on LP tanks:

I was told the Home Depot-type inexpensive, pre-filled LP tanks that you
trade your old one in for were not legal for use on an RV. I assume that's
true - can anyone confirm?

If the original tanks are rusted and I want to get new ones, is there any
reason someone would want the old non-aluminum ones?

I'm looking at replacing the regulator on my Globetrotter. The Fisher one at
Inland RV is about $120, but there are other RV parts places that sell other
brands for around $30. Is there any reason I need to buy the Fisher?

It looks easy to replace the hoses between the regulator and the tanks. Is
it best to also replace the line between the regulator and where the propane
lines start branching out under the trailer? Mine looks like a corrugated
conduit, about 1" diameter. No obvious damage, but old. Should I dump it?

Thanks!
Kathy in Seattle