Your wife has a legitimate concern. She may not be distinguishing between, gas, oil, rubber smells but I haven't come across a garage used to store power equipment that doesn't have some level of petroleum based sell.
Generally smaller rigs below 25' have the furniture fold up against the walls and you store the toys in the main living area. Above 35', there is generally a separate walled off garage. In between, it depends on the model. You may find the stray model that deviates but they will be rare.
Of course if you are messy spilling gas and oil, I wouldn't count on the wall containing all the odor.
