The new designed Carriers have a drain system that is built into the unit. I attached my existing drain line to the connector that was provided. You can install it without the drain line, but you may have some water running down the trailer side on humid days. From the site where I bought my unit:
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THIS IS THE ALL NEW DESIGN THAT YOU HAVE BEEN WAITING FOR..HOT OFF THE ASSEMBLY LINE.. ALL CONDENSATION CAN BE DRAINED AWAY VIA HOSE.."NO BLACK STREAKS".
Thanks Andy, Do you know what model number for the suburban will fit in? Does any water heater fit?
Mark.
Suburban NT-s0 SP is a popular model.
But, you may have to be a little creative to install it in a 43 year old trailer. Attaching it to the duct work, is the hardest part.
You will need an adapter plate for the water heater, even if you us a 10 gallon version, since the outer dimensions are much smaller than what you have now. It's not a big deal to install the plate with sealer and Olympic rivets, and then cut a hole for the new water heater.
I am on vacation, so I cannot give you any dimensions until I return on the 22nd.
I just found carrier ac's at www.rvexit.co Ebay listing . New in the box $ 526.00 to $571.00 Heat strip. Shipping $99.00 My Colemans both of them shot cra- . Even after I spent $$$.00 to have services on both. But then again it is a 1982 AS 34 foot Limited / Coleman 6746 A Mach lll EL Series. I hope one ( 1 ) will do as the $$$.$$ are tight.
I replaced the heater in my 72. You can get close the the old dimesions with a new heater but it will not fit exactly. The only hard part was making new duct work to tie into the old duct system. It's all just sheet metal and rivets so it's not too bad. Just takes a little time.
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. New in the box $ 526.00 to $571.00 Heat strip. Shipping $99.00 My Colemans both of them shot cra- . Even after I spent $$$.00 to have services on both. But then again it is a 1982 AS 34 foot Limited / Coleman 6746 A Mach lll EL Series. I hope one ( 1 ) will do as the $$$.$$ are tight. 
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