Where there's a will (and some money) there's a way.
1] Tongue weight. You need a heavy duty trailer dolly that will put the tongue on relatively-big tire(s). Here's one possibility.
Ultra-Tow Extreme-Duty Adjustable Trailer Dolly, Model# TMD-1000C | Trailer Dollies| Northern Tool + Equipment
2] You need a receiver hitch mounted on the back of the trailer. A good welding/fabrication shop can get that done. I had a receiver hitch added to the back end of my 5er and drug a 5x10' box trailer loaded with golf cart, generator, gas for the generator, and other items
Or instead of the above two changes, just get a powered trailer dolly good for more tongue weight than your trailer has. For example, here's one for 750 pounds max tongue weight. That should be good for the average tongue weight of a trailer that weighs 5,770 pounds. (The sales hype claims max trailer weight of 7,500 pounds, but that assumes an unrealistic tongue weight of only 10% of gross trailer weight). . If you order today (Veterens Day) it's on sale for $1,399.
High Quality Heavy Duty Powered Motorized Trailer Dolly - 7500lb Capacity
If your trailer is heavier than 5,770, they have one for a so-called 10k trailer (770 pounds max tongue weight)
But that heavy gasoline powered electric start dolly is going to be something you have to haul to where you need it. In the bed of the pickup?