If you think 130W panel is heavy to tilt, try 250W :)... It's really a 2-man job, very inconvenient to work on one corner at a time.
Without combiner box, when you only have #10 MC4 wire, adding a few feet of MC4 extension (for tilting) is very easy. TS MPPT 45 would still let you connect MC4 in series without combiner box, but TS 45 wouldn't. Better to scrape the tilt idea altogether. Flat 260W is very little, don't know about KS but for "mostly solar" living I would go for at least 100W more.
Mex - in "dry" Mexico UV is is a byatch. Worse than humidity. Will take thin piece of coated wire (like those they use on coiled cable with new microwave etc) over Polyethylene cable wraps any time. Still, better to hide any ties under the panel.