My motorhome tanks have been filled but I can't get enough propane to light anything?
Anybody please and thanks for your time.

Donuts to dollars your pressure regulator off the tanks are bad and won't let enough (pre set) pressure through. Usually that's checked when filling big tanks.
If these tanks are Leased usually your supplier will take care of that as a free service. If not, you need to get a knew regulator. Remember the threading on this is reversed to loosen supply lines.