For grounding, run a wire to each headlight instead of just grounding the headlights on the trailer. They are lighter than some of the cheap ones I've bought from AutoZone, Home Depot and O'Reilly's.
Houseables Reflective Reflector Visibility Adhesive
9 Review
Pirelli Ice Zero 2 205/60 R16 96T winter
16 Review
Semi-synthetic engine oil LIQUI MOLY Special Tec AA 5W-30, 1 l, 1 kg, 1 pc
14 Review
π Safe Way Traction 2" x 12' Roll 3M 983 Series Diamond Grade Conspicuity Trailer DOT-C2 Reflective Safety Tape Red & White 6β/ 6β Pattern 983-326: Enhance Trailer Safety with High-Visibility Reflective Tape
9 Review