We like our Timber Ridge too.
Here's a couple of our mods:
1) The slideout side wall has a "drip rail" at the bottom. But on one side it didn't cover the edge of the slide's plywood floor leaving that exposed to the elements. I cleaned it and smeared 3M4200 adhesive caulk on the plywood edge to protect it.
2) On the other side of the slide, the "drip rail" managed to conduct water to the trailer interior (if the trailer was slightly tilted in that direction). Weird, took me a year to figure out where the water was coming from. Removed the drip rail, cleaned out its moldy inside (the putty tape hadn't filled it completely and water was somehow getting inside the drip rail and draining toward the trailer), re-caulked and re-installed.
3) Those Lippert electric stab jacks are pretty weak. Especially when there's not much distance to the ground, you can't put much weight on them before they kink (as I found out). So I bolted on lengths of 2x2x1/8" steel box to reinforce them.
4) Also the motors on those jacks can get water inside them, especially when driving all day in the rain. They then corrode and can freeze up (as I found out). At Lippert's suggestion I pulled out the rubber cap by about an inch and smeared dielectric grease all over the exposed motor and where the wires go in, then slid the cap back on.
5) Added solar panels and an MPPT charger ...
6) Other stuff I can't remember right now.
Have fun. They're great trailers and fun to work on.
EDIT: Like your truck too.