We have the Same rig
We got the same rig in April and love it, so much storage and space inside. So far I have installed dimmers for all the ceiling lights, we found them way too bright. next a 2 gallon water tank to the pump isn't always running. And an extra battery to feed the hungry fridge. Hope you enjoy it as much as we do ours!
2021 Montana 3761FL w/res fridge 400ah lithium batteries, RVlock
2019 6.7 diesel F350 DRW truck with Banks derringer
and 4"exhaust, airlift bags, 25,000lb B & W Companion hitch