The economy has to slow to some extent but that doesn't mean doom and gloom, necessarily. This time the housing market hasn't gotten way out over its skis like during the last two really bad recessions (1980 & 2008). Housing seems to be the catalyst for the really bad times. Sure, RVs, boats and cars matter but not like housing.
Everyone will undoubtedly fight for their favorite political team and blame the other side. On the bright side, roughly 1/2 will be correct :)
If I were in the market for a new truck I'd wait until the end of the year if I could. Lots of new models and offerings right now. I think it will be much more of a buyer's market at the end of this year.... likely even more so at the end of 2020 if you can wait that long.