That's cool. 5e offers favorable options for spell research, but you've got an off-the-peg option as a repeatable ritual for something done in travel time when you might not be busy.Sounds like time for Tenser's Wagon Train.
Also cool, but spell slots? Even if you can houserule an upcast for floating disk and as long as you don't need your high-level spell slots, after up to eight hours of travel, when you get to your destination.Just let the spell make bigger discs when upcast. ...
Upcasting floating disk might just double the capacity - but why not just ritual cast twice?
Still cool. 5e also seems to indicate that a wagon can move at the full rate of a horse (whereas in reality, it might have been relatively slow and for a potentially, significantly shortened travel day.A wagon pulled by two draft horses can carry 5,000lbs. ...
Even so, a draft horse has 40ft movement while a phantom steed has a 100ft pace.
With flying carpets (or broom of flying), the use of the ritual spell could get you large carpet capabilities at small carpet speeds.
|3 ft. x 5 ft.
|4 ft. x 6 ft.
|5 ft. x 7 ft.
|6 ft. x 9 ft.
With something like this or a mount with horseshoes of zephyr you, potentially, could easily also outrun warships and run rings around smaller boats while being less detectable to creatures below. (DMs have often ruled that floating disk can travel over surfaces like lava and water).
|1 1/2 mph
|2 1/2 mph