I think I've seen the kind of space you're talking about, but in some of the models that had this space, there was sometimes 3 doors to access the space. One on each side and another at the rear, which was the largest opening. As I recall, these models did not have a slide unit for the bedroom........maybe that decides which models have it. I guess my concern would be to find out exactly what is located underneath this floor space, before you go drilling into it.
What year and model of MH do you have?
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Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain