We have a 2015 x213. My first question to you would be, what is the tow limit of your Forerunner? what is the max tongue weight? and what is the payload? I ask because I see Forerunner's available at 5000#, 7000# and 2015 models towing 4700# so I have no idea which model you have. That being said, it may not make a difference as they payload seems low and even less on the V8 7000# model.
So, my initial thoughts are, the Forerunner is not the vehicle for this trailer. The problem is the tongue weight. It's frickin' heavy. Nowhere near what their dry tongue weight is advertised at. We packed for camping, and we were pack decently light as we came from a PUP and this was our first trip so we don't have extra TT stuff yet! And we did NOT pack bikes.
The tongue weighed 595 pounds with one partially full propane tank, electric tongue jack, battery and NO spare tire as had removed it trying to get the weight down for the vehicle we originally had when we bought the trailer. There was 20# of bedding on the front bunks, a bag of dirty laundry in the wardrobe, 4 towels hanging on the hooks in the bathroom, kitchen cabinets have 6 Corelle plates and bowls (the cheap plain white stuff), 2 pots, one frying pan, some plastic cups, and some other kitche stuff, nothing too outrageous.
With the trailer completely empty of all our gear, the tongue weight is 518# with just the battery and tongue jack. NO spare tire, and NO propane.
Overall the trailer weight 4900 pounds without bikes. So, that being said, if you have a 4700 pound towing Forerunner, you are out of luck 100%. If you have a 5000 pound Forerunner? You're at your weight limit, and likely over payload. If you have the 7000 pound Forerunner? Well the weight is good, but your likely over payload.
The payload on the 7000 pound Forerunner is 1090 pounds and barely more on the 5000 pound model. 650 pounds at least tongue weight including bikes (and maybe that's low, we haven't had a chance to weigh with bikes, it's -20F with windchill here right now), then you are left with 440 pounds for your entire family AND anything you want to carry in the vehicle. Add up you and your significant other's weights, any kids and see where you get there. How close would you be to payload? And also know that if you have added anything since you got the vehicle from factory, that also takes away from your payload.
ETA: and we bought this trailer hoping we could keep everything just below the limits with our 5000 pound tow capacity SUV and our skinny family.
After having it a week and weighing it a zillion different ways we knew there was no safe and comfortable way to tow it with the SUV we had. We are now truck owners. LOL And our truck has just over 1500 pounds payload, and that is really just the bare minimum for what we need but I wanted the extra features the fancy truck had to offer which gave less payload.