The problem with using non-silicone sealants (Dicor) is multifaceted.
1. Using one sealant type for all roof top applications eliminates the "now, which one did I use in that spot before" conundrum.
2. Cleaning REALLY well, well enough to remove all traces of Silicone is not always easy or effective. Ask any paint technician about removing all traces of any silicone product before painting they'll tell you it's pretty difficult to do completely. Sure, you think you've done a good job of cleaning it up, but have you really? Tough to know for sure until your Dicor doesn't effectively seal that area.
3. The next owner of your RV will need to know where you deviated from the factory silicone to apply Dicor instead.
I get it. Dicor is easy to buy and easy to use. However, there is a reason Winnebago and other manufacturers don't use Dicor when building their RVs. After all, it's cheaper and easier to source. I know I've used Dicor when I installed new roof items (solar panels, etc). Why, because it was readily available. But I regret doing it because now I have one factory panel sealed with silicone sealant and two DIY installed panels sealed with Dicor.
Sure, I remember this... but the next owner???? Good luck.
I plan on removing the Dicor sealant and reapplying with NuFlex311 just to make things simpler for the future. (Dicor is easy to remove and leaves no residue behind that would interfere with the silicone products.) And, I keep a couple of spare tubes of NuFlex at home and on the RV just in case I need some for a future project - so, now it's readily available, as well.