When at home, the trailer connects to my house phone system and while we are on the road these phones can answer our cell phones using a bluetooth accessory. The multi-line phones are running from a 1A2, 620A2 modular pannel in the trailer basement.

Because anything in a trailer has to be anchored down, the desk phones are bolted to the desk or shelf using a long screw through the phone base and held in place with a wing nut from underneath. Rather than drilling holes through the bases, I used existing holes to avoid damaging the original phone equipment.

Phones in our current trailer. For more photos of the trailer see our New Trailer gallery

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These are the phones we had in our old 5th wheel travel trailer (sold in summer of 2016) and were fully functional.

	Living Room (rear of trailer) Western Electric Beige 2 Line Princess phone Yes the phone's night light works. It receives its power from the trailer KSU Large view
	Tolet room Western Electric Yellow 2 Line wall phone Large view
	Bedroom Western Electric Beige 5 line office wall phone Large view
	Dining Area Western Electric Yellow 2 line wall phone Large view
	Office Area Western Electric Beige 2661A1 Multi-line desk card dialer phone with a Plantronics Star Set Headphone Large view
	Key Service Unit located in the storage area under the bedroom Western Electric 551C Key Service Unit with ringing frequency generator A key service unit operates the office type multi-line phone sets in my collection. This unit will operate 4 lines. Each phone line requires one of the circuit cards (known as Key Telephone Units or KTU). I have 3 phone lines and one direct to house line operating in the trailer. The direct to house line uses 2 415B, Automatic DC Signaling Private Line KTUs. Essentially, when one picks up that line, then the equivalent line rings on all the phones in the house and vis versa. Large view