Are you going to keep the trailer at your home ? If so, you could look into what it what cost to have an RV hauler put it there for you. The dealership would know of local ones. Or ones coming in with a load and having a side paying job could help someone from having to dead head back.
This would give you time to make a decision and lessen the potential financial loss from having to make a hasty decision.
As far as the truck, what is the difference in the options on the truck you already have ? Is it springs (fixable, not a terrible amount of money), rear-end gears ( a more pricey, but fixable issue) or what. If you could upgrade your truck to what you need for less than what you are going to lose by trading again then you could be further ahead UNLESS you intend to upgrade the trailer again and need a bigger truck.
You need time to look into engine combinations, rear gear ratios all the stuff that will come into play depending on where you intend to go with the unit.
At least that is my take on it as 1 hasty decision can lead into another if you don't have the latitude to step back buy correctly this time.