Separate garages of that size are hard on bumper pulls, that's one of the reasons we traded up to a 5th wheel, so we could get a 12'6" separate garage. Our old raptor bumper pull (now sold as a Carbon) was only a 9' garage, which was barely enough to fit our 2 seater. And that thing felt like towing a windsail.
2020 Keystone Montana High Country 294RL
2017 Ford F350 DRW King Ranch
2021 Ford F350 SRW Lariat Tremor