A Ranger has Frugal as their default Treasure rating. It has occurred to me that a select few members of this Culture might be honoured or recognised as being worth supporting them having a riding horse. Culturally it would give a Dunedain Chieftain the ability to send a moderately sized group of Rangers on a particular mission e.g. A group of six trolls is identified and the alarm raised. Eight Dunedain are dispatched to reinforce the local cell of three Rangers and so intercept the trolls with a significant force.
Based on ROTK, these mounted Rangers would be awarded a Grey Cloak as a very low key, but very important, symbol of their status within Dunedain society. And they would be eligible to be a full member of The Grey Company of the Chieftain, after a period of service or errantry. Only Dunedain and Elves of Imladris, the Havens and Lothlorien would recognise that the cloak has such a significance.
Such Rangers have access to a riding horse (not a beast of burden) without having to accumulate the Treasure needed to raise out of Frugal status. Several Ranger refuges in the wild have the resources to stable/supervise a mount or two for a few days
As a separate extension, the Grey Cloak itself might be considered as being made with elf qualities (woven by elves of Imladris, and very specially by Arwen Undomiel?) So, a +1d6 Stealth Useful Item? Or +1d6 Awe.
In my own head this is the reason why Halbarad could only gather such a small group to travel to Aragorn in Rohan.