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I second the asking comment. Asking to see the actual model up close or to even soak in one isn't unreasonable. The dealer may or may not accomodate you, but the request is certainly within reason.
What would a customer do who wants to try that particular model, travel 200 miles to the dealer who does have one on the floor? That sounds unreasonable, too.
But this is where I will ask you, if you where that other distant dealer, would you move things around in advance into the wet test area for someone coming from that distance to wet test?
If I was a dealer 200 miles away I'd tell the customer to call the day before coming, to 'make sure we didn't sell the tub' That way I would know for sure he/she was coming and if the tub was empty I could fill it (I'd probably siphon hot water from another tub), since heating a tub overnight, from what I have read here, isn't feasible.Otherwise, I'd be very leary of a distant customer.