Sounds like you know the routine for hill climbing! The rear rads do tend to get clogged from dust, especially when the slobber tube is liberal. Annual cleaning with Simple green or some thing similar has been very helpful for many owners.
Does the basement ac keep the coach cool? There are lots of threads here discussing that!! It does depend a bit on what you mean by "cool", but there are some possible problem areas. Mine does very well to a bit over 100. In tX this summer, 115+ outside got inside temps into the low 90's. You need to be sure both compressors are running. The second should kick on if temp requested on 'stat is 3 or more degrees from the temp on the 'stat. You can easily see if one or both are running when you are on 30a shore power or on the generator as the amp panel will show apx 17a when 1 is running, and apx 24a when both are running. A burned start up capacitor is most common cause for the 2nd compressor not running. Another common problem is seperated duct behind the rear cap, commonly at the bottom elbow turning up, or at a seam a bit over halfway up. I got mine working a lot better a couple of times by retaping the bottom elbow. Some owners have retaped the upper seam by using a long stick. You can normally detect a duct leak by feeling up behind the cap OR the outer surface of the cap on a hot day when the ac has been running for awhile.
If you search the old threads you may find discussion of air temp. I have checked mine with an infrared thermometer. I check air temp at the intake under my bed, and by holding the temp sensor pointed into a ceiling duct. Output air temp is apx 20 degrees cooler with one compressor running, and up to 40 degrees cooler with both compressors running.
