I can help with the KDG - I'm researching a private. Carole Divall, WONDEFUL woman and military author, looked this up in the Kew records.
KDG 1811
2nd November: STATIONS: Ireland. The regiment reviewed by Major General Mitchell at Dundalk.
29th December: The regiment marched from Dundalk to Dublin.
KDG 1812
12th March: STATIONS: Ireland.
Warrant dated this day: Alteration of Horse Appointments. Leathers Brown, and saddle pad divided. Cocked hats abolished and replaced by Helmets with Long Horse hair tail. An alteration was made in the establishment. The 12 Troop Quartermasters were replaced by a Regimental Quartermaster (James Scott) and 12 Troop Sgt Majors, and 1 School Master Sgt. The total establishment was at this period 46 Commissioned Officers, and one thousand and thirty seven attested soldiers. Establishment: 1 Colonel. 1 Lt. Colonel. 2 Majors. 12 Captains. 12 Lieutenants. 12 Cornets. 1 Paymaster. 1 Regimental Quartermaster. 1 Surgeon. 2 Assistant Surgeons. 1 Veterinary Surgeon. 1 Regimental Sgt Major. 2 Troop Sgt Majors. 1 Paymaster Sgt. 1 Saddler Sgt. 1 Armourer Sgt. 1 Schoolmaster Sgt. 48 Sgt's. 12 Trumpeters. 960 rank and file. 916 Horses.
12th June: The regiment reviewed by Major General O'Loughlin at Dublin.
17th August: The Warrant dated 12 March 1812 is cancelled by Warrant dated 17 August 1812. Appointments; Leathers Brown, and saddle divided. Narrow waist belts without bayonet frogs. Cocked hats abolished, replaced by helmets. Leggings abolished. One pair of boots to be issued to each man every three and a half years. Leather breeches and other articles of necessaries discontinued.
7th September: The regiment marched from Dublin to Clonmel.
14th October: Head Quarter Troops at Clonmel inspected by Major General Lee.
KDG 1813
27th January: STATIONS: Ireland. Sir, David Dundas appointed Colonel of the regiment, vice,Lord Heathfield.
27th April: The Post Boy conveying His Majesty's mail from Clonmel to Limerick having been robbed on two successive nights the Post Master applied for a mounted escort. Troopers Joseph Englefield and Abraham Cook from the regiment were ordered to that duty. They succeeded in securing two men of a desperate and well-armed gang who had long infested the neighbourhood. The two Dragoons received the thanks of the Magistrates and a reward of £10 each.
12th May: The Head Quarter Troops, Captains, Graham's, and Fairholms Troops, inspected by Major General Lee.
28th May: A detachment of 1 Corporal and 17 Troopers, and 18 horses embarked at Cork for a particular service on the Peninsula.
19th June: Augmented four boys per Troop. Total establishment one thousand and eighty five as per War Office letter dated 19 June 1813.
4th October: The Head Quarter Troops, Majors Graham's, and Gores Troops inspected by Major General Lee.
25th December: Alteration in Officers and Men’s clothing. Narrow cross barred lace taken away. Plush breeches abolished and replaced by web. Short gloves commenced.
KDG 1814
25th July: STATIONS: Ireland. The Establishment of the Regiment to be reduced so as to consist of the following numbers. Ten Troops. 1 Colonel. 1 Lt. Colonel. 2 Majors. 10 Captains. 10 Lieutenants. 10 Cornets. 1 Paymaster. 1 Regimental Quartermaster. 1 Surgeon. 1 Assistant Surgeon. 1 Veterinary Surgeon. 1 Regimental Sgt Major. 10 Troop Sgt Majors. 1 Paymaster Sgt. 1 Saddler Sgt. 1 Armourer Sgt. 1 School Master Sgt. 30 Sgt's. 30 Cpl's. 1 Trumpet Major. 9 Trumpeters. 470 Dragoons Mounted. 100 Dragoons dismounted. 10 Farriers. 20 Lads or Boys dismounted. Total 726. 565 Troop horses, including those for the Non Commissioned Officers, and Trumpeters. Captain's Dawson's, and Bernard's Troops broken up. The two junior Lieutenants, viz. Hawley, and Branden, remain as Cornets, with the rank of Lieutenants.
30th August: Discharged and not recommended; Sgt nil. Cpl 2. Farriers nil. Dragoons 137.
28th September: Discharged and recommended; Sgt 12. Cpl 3. Farriers 2 Dragoons 160. (reduction).
26th October: Discharged and recommended; Sgt 1. Cpl nil Farriers nil Dragoons nil. (reduction). Head Quarter Troops marched from Clonmel to Cork to Embark for England. 2 Troops from Fethard, 1 to Bandon, and 1 to Fermoy. 1 Troop from Carrik to Clogheen, and 1 from Gort to Limerick.
26th October: Head Quarter Troops at Cork inspected by Major General Forbes.
13th November: 13, 14, 15 November 1814 Seven Troops embarked at the Cove of Cork for Bristol.
24th November: Seven Troops disembarked at Bristol no casualties.
25th November: 4 Troops marched from Bristol, 2 to Coventry, and 2 to Leicester.
26th November: 3 Troops marched from Bristol, 2 to Coventry, and 1 to Warwick.
Hope this helps!