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For reference, that 15 F design number for inside versus outside we keep seeing is probably in the right ball park for many RVs by “coincidence”, or by choices RV engineers make at factory, but it has very little to do with how cold an RV can be in any ambient condition.
For example, RV air conditioners are indeed capacity rated at 95 F ambient and 80 F inside temperature. That is 15 F but only means a 15,000 BTU/hr air conditioner will cool at 15,000 BTU/hr at those temperatures (and at 50% RH inside if I recall correctly). That rating does not preclude that same A/C from operating at other conditions, though cooling rate could (and probably will be) much different.
Also, many RV air conditioners have air flow rate designed so that air going in and out of evaporator cools down by at least 15 F (sometimes 20 F or more). Again, this selected A/C design air flow does not directly prevent air conditioner from cooling inside of RV to a much lower temperature than 15 F below outside ambient temperature.
Inside versus outside temperature that can be achieved is mostly limited by air conditioner capacity versus total heat load on RV. Increasing A/C capacity (2 units versus 1 as example) or reducing load on RV (park in shade, cover and or have dual pane windows as examples) can result in inside temperature being much lower than 15 F below ambient.
My son’s not-too-large Class B+ came with 2 X 15,000 BTU/hr units, and with its fairly good thermal design, can easily stay cool parked in 100 F Texas sun. A differential of 30 F is possible, though it is overkill in other ways — unless one was planning to camp in desert regularly, two smaller A/C would have been preferable.
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