For me, it is adding something that means you can enjoy the trip without having to be always thinking or compromising.
So first was upgraded Battery System and Victron Multiplus - use same sockets on or off grid, plus fast recharging of batteries when plugged in (after installing one in Camper, another one in the new Motorhome was a no-brainer).
Second was changing the 2 Calor Gas bottles for a hybrid Calor/Gaslow setup. Refill where possible, but extra flexibility to bottle-swap if situation demands it.