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Lots of science actually goes into truck trailer dynamics, but in your case it should be fairly straight forward. Looks like rear of truck is a fair distance from rear axle centreline, so even though it is a “truck” you need to be cognizant of tongue weight due to that cantilever effect. Should be obvious, but any trailer hitch must be tied into the frame and not any other metal work or decking in your case. Also, make sure track width of trailer axle(s) match that of your rear axle. This is very important as if it is narrower, this can lead to dynamic instability. Tongue length and trailer axle(s) distance to hitch is another important variable in determining dynamic stability and manoeuvreability. In other words, a large vehicle like that fire truck, needs an equally large trailer. We’ve all seen folks towing a wheeled log splitter home from Home Depot. Lol!