Flatbed tandem or multi axle

Without knowing for sure where you are running out of you wont get a good answer. I'm assuming Southern Ont because you said you ran Detroit. The bigger thing is you need to find a carrier that will utilize your trailer for the most money. If they dont have experience with permits its no use to get a multiaxle trailer. I would lean toward a non spif 3 axle with 10 foot spreads myself if your running the midwest and down toward Alabama etc But you're on a limited time frame for using it. And a spif 3 axle loses a lot of weight over the old ones.