Hi Preach,
If your trailer was a car trailer, and with those 5 lug hubs, then you definitly only have 3500# axles. And if you really have 1500# of tongue weight, then anything you can do to help that is a plus! Thats alot of tongue weight! I dont know of any drawbars, even solid ones, that handle that tongue weight. The solid drawbars are good for 1000# of tongue weight.. With your 1500#, you need to be pullin that with a HD truck with a plate hitch with a pintle hook.
One good thing about all that tongue weight is, that is less weight that your trailer axles are carrying. And that i think is the biggest challenge you have there. I dont want to sound like the party pooper, but i really think you have the wrong trailer for your setup. I would love to know the empty weight of your setup. I wouldnt be surpised if its 4,000# or better. Thats not leaving you much at all for logs. One or two decent logs, and you are overloading those axles.. And the axles are one piece of gear that is not under rated by much. I've seen and replaced ALOT of trailer axles, and these 3500#-ers are the most common to get bent. It doesnt take much, i got a bent one on my own trailer! Got the new axle beam, and am gonna get it changed out next week.
Good luck, and be safe! It would be a sin to over weight that trailer and have it break loose from the truck and take out an innocent family in an on comming car. And sadly, it has happened...
Ron