Nothing unique to it being an RV. Back in the pre-computer days we used to press the accelerator down before cranking the engine, once to set the automatic choke on a cold morning. But a 1987 probably has an full scale engine computer (ECM) and may not need that.
What chassis does it use - Ford F53 or Chevy P30? You should be able to download a chassis owner manual, and probably a service manual too. I think I have a pdf copy of the 1986 Chevy P30 service manual on file somewhere.