In my 75' Tradewind, I've got this low spot in my floor just aft of the door and generally in the middle of trailer (side to side). Looking at the chassis diagram in my service manual I can see 2 possible reasons for this.
First, there is the cavity which contains the fresh water tank (item #30 in diagram). This cavity runs the length of 2 cavities to accomidate the tank and has a minimal cross member (see item #21 in diagram) at the top just under the floor half way between the 2 cross members forward and aft of the h20 tank. It could be that this crossmember is simply not strong enough and over the years the floor has sagged a bit.
Second, the cavity just aft of the one containg the H20 tank appears to also span the length of 2 normal cavities but lacks any cross member at all. The daigram does not suggest that there is anything in this cavity so I am wondering why thay did this...
Since I am not 100% sure where my h20 tank starts and begins I am not sure which cavity I am standing over...
The low spot is not that noticable but I am worried that when I put my new flooring in there will be issues because of it. My question is does anyone else have this low spot in this area of their floor?
BTW, I've got the flooring out and the plywood seems to be in good condition other than the low spot.