Thanks for the tips. Yeah on mine the water lines are inside the trailer, but the trailer itself is essentially just a big non insulated cargo box. Basically same configuration as a Turtleback, a box with a slide out kitchen in back, RTT on top. So it’s not like a teardrop that has an insulated cabin. I cant really visualize any way to insulate the whole cargo area. Adding a heater or that heat tape could possibly work. We’ve had this trailer for about 4 years and are nearing outgrowing it anyways. So 4 years in I’ve mostly just accepted the cold/water issue as a downside of any of these style of trailers. They are all just a cargo box with a tent on top, Turtleback, Patriot, Bivouc ect all have this same issue. At this point mainly just exploring something that’d fit out family as the kids keep growing. Ideally would’ve that Bruuder EXP4 as it’s so small on its own, but can have the 2 older kids in a hard shell tent on top and parents with our younger kid and dog inside below. Virtually zero setup with that route also