I've used it on vehicles with success.
Need to clean. Then use machine.
With an RV, think of it as a "smell detector ". The 25-30 year old TTs I've had have all had good original interiors. "Clean" got cleaned again.
The TT got closed up after treatment and airing.
Any new source of odor is easier to track down, thus address.
1990 35' SILVER STREAK Sterling, 9k GVWR
2004 DODGE RAM 2WD 305/555 ISB, QC SRW LB NV-5600, 9k GVWR
Hensley Arrow; 11-cpm solo, 17-cpm towing fuel cost