Ok. so is your intent to really go touring, pulling a trailer designed to be pulled by a car
I am guessing that you don't have the bike yet, but that is not 100% clear
Politely put this is quixotic at best...... totally not feasible is more accurate.
Bluntly put: this is stupid and not feasible, don't do it is is dangerous.
First lets look at the bike
http://worksmancycles.com/shopsite_s...html/pav3.html
Look good to excellent for an OFGAB (Old Fart Get around Bike), but I question that it is well suited to touring or longer distances. If you on anything but flat ground you will need some very low gearing.....might have to go rolhoff if it will work. Electric assist may help
This really looks like like round bike and square usage hole deal.
If you are dead set on that bike...get it and try to pull something around of even 500 lbs. You will make your decision very quickly
Then look at all the issues with towing heavy loads. If the trailer ways more than you and your bike or even similar uphill will be torture witout proper gearing and down hill or even stopping from 10 mph is going to be a real safety issue.
creative thinking is good, but this sound like drilling holes in the bottom of a boat to make it lighter so it floats higher.