Hi, well for moldings that are coming off I would suggest going to an auto store and buying something like a 3M exterior trim glue (or something similar) and ensure that trim piece is reattached properly. Then you can finish up with your caulking repair.
If you try the Geocel product (usually available at RV stores) you might want to also ask their techs what product they use/recommend for exterior window trims etc. Once you get the hang of applying Geocel it is not bad.....but it can become a sticky mess quickly if you are not careful. I think you can use isopropyl alcohol to clean it off if it goes where you don't want it (before it cures). Also if you tape off the edges of the area you are going to caulk you also cannot leave the tape on very long after applying the Geocel or it will stick to the painter tape and give stringy strands. Practise on something before using it on your coach.
By the way, many caulks go on very easy and are very easy to finish.....but always check the tube for how long it takes to cure......some of them take a week(s) or more to fully cure; so not great if rain is in the forecast.
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