Welcome 69 Avion,
Congratulations on the rig. Here is some specification data for the 1969 model year that should help you determine what model you have.
Model Length MSRP Hitch Wt. Weight
Sports Special 18' 3" $3,995 320# 2,490#
Tourist 22' 2" $5,984 470# 3,500#
Tourist 22' 2" $6,225 425# 3,785#
Argonaut 25' 6" $7,075 435# 4,190#
Travelcader 28' 1" $7,721 550# 4,380#
Imperial 31' 2" $8,126 575# 5,065#
The water intake and waste connections are typically located at the street side rear corner of the trailer. We have a 73 model which was a first year body style change so I'm not certain that ours is the same as yours. Our water inlet is located inside the access hatch just to the rear of the water heater cover. The waste connection and dump valves are located in a curved hatch located below the water intake connection. The dump valve handles are there too.
We have several Avion owners here who may be able to assist you as well. You might want to PM Silverhobby, or Kristi Foster as they both own, or recently owned 1968 and 1969 model years.
Here are a few more links that may help.
Link to a copy of the 1969 model year owners/operation manual.
Link to the Avion yahoo group where you can get Avion specific repair and maintenance advise for your rig.
avioncampingandrestoration : Avion Camping and Restoration - Repair,
Dr. G's site is another good resource site for Avions.
Fleetwood Avion Travelcade Club Travel Fifth Wheel Fleetwood Trailer RV Cayo Motivator LeGrande Indiana Unit
Good luck and post some photos when your schedule permits,