Summarizing prior post + posting from others with experience with toy haulers
Trailer dry weight: 7000
Minimum options & gear, no toys: 1000
Total trailer weight w/o toys: 8000
Plan for minimum 15% on tongue as toy haulers are heavy up front results in following weights on truck:
Tongue weight: 1200
Approximate hitch weight: 100
Weight on hitch: 1300 (trailer tongue weight + hitch weigh) exceeds hitch 1220 rating
Weight on rear axle from truck 50% of 5000 is 2500
Weight on rear axle from truck, trailer & hitch 2500 + 1300 = 3800
Available payload for passengers & gear 0 lbs
Excluding 5th wheels, which require even greater payload, folks on this forum have reported towing 8000 or less when asked what they were towing with the max payload version. These were not Toy Haulers which have the heavier tongue weight. I recognize you have the 2015 that has a lighter chassis which buys some payload, but the max payload on the 2011-2014 years have a higher RAWR (4800) and GVWR (8200).
What folks are towing with Max Payload 150sIf you really want this trailer then numbers point to a truck with greater capacity.
You may get more information from people towing similar rigs if you posted to the forum asking "What truck to tow a 7000# dry Toy Hauler".
Good luck to you,
Stu