Basement floor to replacement questions

[firedreamer2]

Next project, I have some soft strand flooring in the basement in front of both compartment doors. Have cut and rolled back vinyl flooring and dried both areas but am a little nervous about cutting into the strand board without knowing what kind of frame support structure is under the wood floor. Can anyone help with either a blueprint / diagram or where / who I might call to fine one? I know there has to be stringers but just not what direction they run or any wiring or other utilities that may run under the floor. Thanks the unit is a 2017 369RL

[geotex1]

You can simply get under your coach and look up to see the frame as right by the doors is outboard of the frame rails and supported on outriggers. More than likely, your basement is single ply deck, which is easy to determine by peering behind the bulkheads where it's been penetrated for lines.