DIY Mobile WFO?

I've seen mobile ovens in searching here, but didn't find quite a topic such as this.

I've about a dozen neighbors who regularly eat and enjoy my bread.  The general consensus is that they'd really enjoy buying bread from me (and given our neighborhood cohesiveness, it's not unreasonable to conjecture for more once word gets out) and as we also have a strong farmer's market with a serious locavore scene, low entry costs, it's another possible outlet.  

I've opened several businesses, including restaurants.  Just an FYI that this is not meant to be a real moneymaker - the headaches of developing financials and putting together a financial and operating plan is way beyond me, physically badly shot and mentally burnt to any new ventures of any real consequence.

So, enough to cover materials for a very modest weekly schedule is fine, for the foreseeable future.

I'm thinking of something like the small masonry oven Daniel Wing shows in The Bread Builders, or mud oven serving the same purpose.  We rent and selling even a fixed small mud oven out back is proving  difficult with our LL.

Anyone here built such an oven, mounted on a trailer?