Kip, I agree with the comments above. We're full timing in Rockport. If you're running a single AC, it won't provide enough cooling for your Elkridge. With these large units, two would be the minimum and it could still be a struggle.
A friend of mine bought a Big Country earlier this year and has two ACs. He complained that it wasn't cooling enough. His interior temps during the heat of the afternoon was about 79 degrees.
A Dometic-certified mobile tech checked out the ACs and they are working as they should. He basically told my friend to turn the thermostats down to the lowest setting and let them run. When the temperature reached a comfortable level, only then adjust them to a higher temperature. This advice worked for my friend as his RV is now cool and comfy in the afternoon.
You might also consider installing a third AC. We have three in our Landmark and it is very comfortable in this south Texas heat.