Hey Lamp! Your mod is amazing. I never play without it.

Some historical suggestions for Romania:

Naval Bomber 1: SET 7H
Romanian design - floatplane with 300kg bomb load.
https://en.wikipedia.org/wiki/SET_7
http://worldwar2.ro/arr/?article=766

or

Naval Bomber 1: SM.62
Floatplane with 600kg bomb load; designed by Savoia-Marchetti, built under license by IAR and ICAR in Romania.
https://en.wikipedia.org/wiki/Savoia-Marchetti_SM.62
http://worldwar2.ro/arr/?article=766
__________________________

Strategic Bomber 1: SET 111
Heinkel He 111 built under license. I haven't found much information, but it used the Jumo 211 engine - which was also built at IAR in Romania. So it's possible. Bomb load was higher than on the Ju 88.
https://en.wikipedia.org/wiki/Societatea_Pentru_Exploat%C4%83ri_Tehnice
https://en.wikipedia.org/wiki/Heinkel_He_111
__________________________

Tactical Bomber 2: IAR 88A
Moved from Strategic Bomber 1. I think this fits well because it has the same position in the German tech tree.
__________________________

Fighter 2: IAR 109
Bf 109 built by IAR late in (and after) the war. Some G-4, mostly G-6. Called Ga6, Ga-6, G-6a depending on the source. "a" for "autohton" - "national" or "local". In Germany, these variants were built from late 1942, early 1943 on - so definitely good enough for 1940.
https://en.wikipedia.org/wiki/Messerschmitt_Bf_109_variants#G-3,_G-4
https://forum.largescaleplanes.com/index.php?/topic/32711-messerschmitt-bf-109-ga-6-132/&do=findComment&comment=298785
http://worldwar2.ro/arr/?article=766
__________________________

Scout Plane 2: IAR 47
Also used as CAS 1. It was also meant as a Scout Plane.
https://en.wikipedia.org/wiki/IAR_47
__________________________

Armored Car 2: CKD TN SPE-37
Slightly improved SPE-34; also made for the Romanian police.
https://en.topwar.ru/40520-chehoslovackie-broneavtomobili-mezhvoennogo-perioda-chast-ii.html
__________________________

Armored Car 3: Autoblindat Model 1941
Domestic prototype made at Resita with a Czech 37mm gun.
https://gmic.co.uk/blogs/entry/532-romanian-armoured-vehicles-used-betwen-1919-1947/
https://gmic.co.uk/uploads/monthly_2017_11/300px-Autoblinda-AB-41-haugh-2.jpg.801aa1a5bed30b7cd6465af26f75802b.jpg
__________________________

Mechanized 1: Malaxa UE
License-produced and improved Renault UE.
https://www.worldwar2.ro/arme/?article=245
https://en.wikipedia.org/wiki/Renault_UE_Chenillette
__________________________

Support Weapons
1918: Schwarzlose Model 1907/12 & Mortier de 58 mm type 2
1938: ZB-30 & Brandt Mle 27/31
1940: MG 34 & Brandt Mle 35
1942: MG 42 & Resita Model 1942 (copy of Soviet 120-PM-38)
https://en.wikipedia.org/wiki/Romania_in_World_War_II#Modern_non-self-propelled_weapons
https://www.worldwar2.ro/arme/?section=18
__________________________

Artillery 2: Skoda 100mm M1930
Barrels manufactured at Voina Works, Brasov.
https://en.wikipedia.org/wiki/10_cm_houfnice_vz._30_(howitzer)
https://web.archive.org/web/20071202052427/http://warandgame.wordpress.com/2007/11/21/skoda-765-mm-kanon-vz-30-and-100-mm-houfnice-vz-30/
__________________________

Artillery 3: Skoda 150mm M1934
Moved up from Artillery 2. I think it fits a little better than the M1917 because it's much more modern.
__________________________
__________________________

And some fictional suggestions:

AT Armored Car: VDC M41/43 - Vânătorul de care Model 1941/43
Autoblindat M1941 fitted with a 75mm M1943 AT gun; both were made by Reșița, so it would make sense.
__________________________

Motorized Rocket: T-1
The T-1 was a Romanian Artillery Tractor based on the Soviet STZ-5. The Soviet version was fitted with a BM-13 "Katyusha" Rocket Launcher. The German equivalent was the "8 cm Raketen-Vielfachwerfer". The T-1 probably could have been fitted with either one.
https://en.wikipedia.org/wiki/T-1_tractor
__________________________

Mechanized 1: T-2
The T-20 was a Soviet armored carrier/tractor captured and used by the Romanians as the "Ford rusesc de captura" - "Captured Russian Ford". It was likely based on the STZ-5 tractor, which was also captured, used and copied by the Romanians (as T-1). It had a Ford-type engine which was also produced in Romania.
http://worldwar2.ro/arme/?article=247
https://en.wikipedia.org/wiki/Komsomolets_armored_tractor#Operators
__________________________

Transport Plane: ICAR 36
This was a small Airliner designed by Messerschmitt, but only built by ICAR in Romania. In reality, the Romanian Paratroopers used the Ju-52, but that was never built or even bought, only captured.
https://en.wikipedia.org/wiki/ICAR_Comercial
__________________________

Naval Bomber 2: IAR 88A-17
The Luftwaffe used a Torpedo Bomber version designated as Ju 88 A-17.
https://en.wikipedia.org/wiki/Junkers_Ju_88#Ju_88A

or

Naval Bomber 2: IAR JRS-79B2
The JRS-79B1 ("Jumo Roman S-79B1") was the best Sparviero model produced by IAR. It had two Junkers Jumo 211F engines with 1400hp each (also produced at IAR), five 8mm machine guns, a 20mm gun and a bomb load of 1400kg. A torpedo bomber was made in Italy and was designated as SM.79-III. So a Romanian torpedo bomber version would have been possible.
http://worldwar2.ro/arr/?article=757
https://en.wikipedia.org/wiki/Savoia-Marchetti_SM.62
__________________________

Heavy Fighter 2: IAR 88C
The Ju 88C was the Heavy Fighter version produced by Junkers for the Luftwaffe. The C-6 had three 20mm guns and three 8mm machine guns at the front. Since IAR produced the Bomber version, this might have been possible too.
https://en.wikipedia.org/wiki/Junkers_Ju_88#Ju_88C_2
__________________________

Heavy Fighter I: IAR 110
The Bf 110 was used by the Romanian Air Force, but not produced in Romania. It used the DB605 engine, which IAR produced under license. So it would have been possible.
__________________________

Strategic Bomber 2: IAR 177
The He 177 "Greif" was never used by Romania. But the DB610 engine it used was basically a "double DB605" - and the DB605 was produced at IAR under license.
__________________________

My personal suggestion would be to use the IAR 88 only for 1940 - as Tactical Bomber, Naval Bomber and Heavy Fighter. For 1936, IAR 79 as Tactical Bomber and SET 111 as Strategic Bomber.