Yes, replace 2017 tires soon. At 7-8 years they are at recommended age limit regardless of appearance. Rubber degrades internally even in garage storage. Plan replacement before next extended trip. Most experts recommend 6-7 year replacement for RV tires.
With a macerator pump, RV-specific toilet paper is not necessary. The macerator grinds paper with waste. Single-ply or septic-safe regular toilet paper works well - Scott 1000 is the most recommended. Avoid ultra-plush multi-ply and wet wipes.
A slow-draining gray tank is typically caused by grease buildup, soap residue, or debris in the tank or drain pipe. Most issues can be resolved with tank flushing, valve cleaning, or using specialized RV tank treatments.
Hieha TPMS is budget option that provides basic tire monitoring. Expect shorter battery life and potentially less accuracy than premium brands. TireMinder or TST recommended for serious RV use.
TST color displays are generally more visible than mono. LCD displays fade with age - a new display will be brighter. Keep your sun shade either way for best visibility.
Failed rubber seals in TST sensors after battery changes can often be repaired by replacing just the seal components rather than the entire sensor. The issue occurs when aged seals can't properly engage the Schrader valve mechanism.