As in a stick-house central a/c unit, all one can count on is 15 degrees (or so) below the outside temp.
Same with a motorhome. Mine....50 amp with 2 roof units experienced high 90s and low 100s degree days a few years ago. A heatwave...one of the worst I've experienced in recent memory. So bad that we decided to leave on our RV trip and travel at nite. Even so, the dash unit didn't do it...we started the genny and ran 300 miles with the dash AND one roof unit on. Arriving so early, our campsite was occupied...the outside temp was 103...and even with both units running full blast, the interior temp was still in the mid-high 80s. So, we used the cg pool a bit earlier than anticipated.