gas tank
I have a Mirage Extreme Snow and it has a 38 gallon fuel tank mounted to the frame between the axles. It has the hose part on the drivers side. One thing I would change is have a larger12 volt pump put in. or you'll get ticked off at the slow speed it fill up the tank. Also have a couple in line fuel filters installed in the hose.
Another thing I would consider since you said you travel 1000 per trip, probably from the Midwest where they put road salt on everything is to be sure to hose it down after your trip.
Also check the welds every so often. The flexing the trailers take is quite a bit. I have a Triton while in the Midwest and I had to have it welded at the joints from flexing and this was on an open four place.