They make them already- just frightfully expensive!
2018 Ram 3500 DRW/crew cab/long bed/4x4/4.10 gears pulling a 2017 Spartan 1245 by Prime Time
Checkout my site for RVing tips, tricks, and info | My family and I have fulltimed since June 2015
I saw in Laughlin NV a Class A with a garage below the back bedroom and between the motor and rear bumper. It had 2 Full Dresser Hardleys in it. and they were towing a trailer with another Soft Tail (?) and a F150. I wish I had had a smartphone that day.
__________________ A rainy day camping is better than any sunny day at work
2004 F250 V10 SD Xcab 2011 Wildwood T26BHXL