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To make any impact on fuel economy you are going to need to supply the electrical system with up to1kwh per mile. Or lets 50,000 watts continuously if you want it to be of any use on a hill.
Or around 25,000 to 30,000 watts or a half kwh per mile to maybe negate the trailers impact on vehicle fuel consumption.
You are better off focusing on the tow vehicl and trailer, mainly aero dynamics.
To give you an idea how much it would cost, just to put brake axles on my trailer it's going to end up costing up to $400 not counting the tires. And I'm doing almost all the work my self.
If you insist on doing this you are better off forgetting about using hub motors, because hub motors are expensive and proprietary. Just use a full floating heavy duty pickup truck axle. Because you know it can carry the weight and handle the drive torque.
Anything is possible with enough money.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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