Hi Matt, difficult to give any advice when you've not said what car or caravan.
90% of the time I use Redneck it's whilst I'm away in the caravan. However I have a Navara and a twin axle van so have the room.
https://www.rib.net/forum/f49/carava...ler-86495.html
I really don't see a big difference in pack size between a T38 and a 3 meter sib in terms of trying to squeeze it through a caravan door.
Personally I would stick with your T38 but protect the door opening with something like pipe insulation sleeves when your loading/unloading your T38.