Hope you got the Tour you wanted! We're about the same age as you and also no kids, two dogs and both own businesses. Unfortunately, our businesses are not at a point that can be left behind. Mine is theoretically mobile, but I find I rely on dedicated workspace and printer/copier enough that working on the road doesn't feel 100% sustainable. DH's requires more onsite babysitting, so it's hard to leave for chunks of time. I think your situation sounds like living the dream!
We've used the RV to travel to a trade show (or essentially worked a trade show into a stop on a vacation tour, however you want to look at it) and I think if your business is mobile and expo-based, your plan would work really well.
We have a Class C, and while that likely isn't the right fit for you, we are regularly thankful for the MH aspects of our RV. I'm sure a truck/trailer option is a great fit for many, but for traveling us and our dogs we really appreciate the MH (and DH appreciates access to kitchen and bathroom while I push on until the gas tank is empty). If I were you, I'd totally flat tow the Range Rover w/your wares in it in a good cooler (maybe good but cheap looking?). Or if the toad has one of those cargo area covers, get coolers that fit beneath the cover. No need to make it look like a prime theft target.
Especially given your background in camping, etc., I'm certain you're going to have a blast! You mentioned potential kids in a couple years - if I were you, I'd keep the Tour (or whatever your first purchase is) until you have the opportunity to reassess the situation post-kid(s). I think that changes so many aspects of the scenario, and it would be a bummer to upgrade and then realize your whole world had shifted in a different direction...
