So here's the deal. Currently I'm playing a level 8 goliath, barb 6/fighter 2. Totem barbarian, 2nd totem is bear. Str 18. We also have a homebrew rule that allows my character to increase by a size similar to the Enlarge effect from enlarge/reduce. My character also has winged boots.
Also in the party, a bard with a constitution of 4. 19 health. The bard is our only support character.
With my winged boots, I tend to favor an airborne tactic to keep me safe from grounded enemies. We have come to terms with the rule that you can't willingly end your turn in another creature's space. I have argued that we could rig a contraption of sorts similar to a sidecar, and I strap into a harness to carry it. The idea being to keep the bard airborne and safe with me, while being technically a square apart.
My DM's only argument against it (and I do respect that the DM's word is always final, I just want other opinions) is that "there's no mechanics for it."
I argue that the only factor that would normally stop other characters from doing this is carrying capacity. With my character's build, base carrying capacity is 1080 lbs. With the growth ability, 2160. Enhance ability? 4320. Carrying capacity is not a limiting factor for my character, I make it a point to carry my boat with me wherever I go.
What do y'all think?