Your Coleman 9420-381 thermostat has failing solid-state switching components causing voltage drop during heating calls. This is a known issue with this model - replace it with a more reliable thermostat or return to a mechanical relay-based unit.
Triple E built quality coaches in Canada. At 24 years old, focus on this specific units condition rather than brand reputation. Critical inspection points: water damage, engine hours, service history, roof seals. Get professional NRVIA inspection before buying.
Find Dometic toilet parts diagrams on dometic.com support section or RV parts suppliers like PPL Motorhomes. Model number is on sticker behind toilet or under lid. Common parts include ball seal and water valve.
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.