Getting DEF_INV to also work correctly with custom IconLibs in the trade menu, while also properly fitting on screen using HUDFr, DEF_UI & Truby9 is complicated and difficult to do. The HudMenu.swf provided by Truby9 caused CTD for me, but I had already autopatched one for HUDFr and DEF_UI, which worked seamlessly with the fix "TRUBY9 ULTRAWIDESCREEN DEF_INV compatibility fix" by Sondral123ad. I do believe he also provides one but I haven't tried it to see if it also works. I will also provide my load order for this using MO2 with picture examples to show the end result. None of this would be possible without the original mods and fix that made the finished product all possible - I will list them all below.

Load Order:
#Mod_Name,     #Nexus_ID,#Mod_Nexus_URL

"Extended Dialogue Interface",27216,"https://www.nexusmods.com/fallout4/mods/27216"

"Valdacil's Item Sorting",   3877,   "https://www.nexusmods.com/fallout4/mods/3877"Val's picks + DEF_INV

"Mod Configuration Menu",      21497, "https://www.nexusmods.com/fallout4/mods/21497"

"Crafting Highlight Fix",    27479, "https://www.nexusmods.com/fallout4/mods/27479"MCM toggle for trade

"No more monochrome -
Color setting for the Pipboy", 11320,   "https://www.nexusmods.com/fallout4/mods/11320"

"HUDFramework",     20309,  "https://www.nexusmods.com/fallout4/mods/20309"

"DEF_UI",    10654,  "https://www.nexusmods.com/fallout4/mods/10654"

"Immersive HUD - iHUD",  20830,   "https://www.nexusmods.com/fallout4/mods/20830"

"HUD Plus Plus",        27218,   "https://www.nexusmods.com/fallout4/mods/27218"

"TruBy9 UltraWide Fallout 4",  24630,   "https://www.nexusmods.com/fallout4/mods/24630"

"TRUBY9 ULTRAWIDESCREEN
DEF_INV compatibility fix",      43278,    "https://www.nexusmods.com/fallout4/mods/43278"

"AutoPatched 21:9 HUDMenu.swf - for Truby9 DEF_INV Fix ------------------------------------------------------------------------ This upload.

"DEF_UI Iconlibs Rescaled
and Fixed",31088,    "https://www.nexusmods.com/fallout4/mods/31088"

"Pip-Boy dual colors",       43338,    "https://www.nexusmods.com/fallout4/mods/43338"

"Ultimate Colored Vault
Boy Animations Overhaul",38658,"https://www.nexusmods.com/fallout4/mods/38658"

This is the rough order, let any following mods overwrite the previous ones - your plugins should also match this if I'm not mistaken(that or I'm OCD and have been giving myself extra work for no reason).

Credit and Thanks to Original Authors for providing everything needed to make this possible:
Sondral123ad - https://www.nexusmods.com/fallout4/users/953478?tab=user+files
ZaliaS - https://www.nexusmods.com/fallout4/users/5669932?tab=user+files
valdacil - https://www.nexusmods.com/fallout4/users/23176?tab=user+files
registrator2000 - https://www.nexusmods.com/fallout4/users/17152929?tab=user+files