I don't see any problem there a 4 1/2" grinder with a cut off wheel would make short work of it then a grinding wheel to smooth it out and then some black paint and no one will ever know it was modded. :)
I like the idea of the awning on the slide out. We do not have a slide on that side of the 5er but a awning there would give us more covered area out of the sun and rain and keep the sun out of the kitchen. :) Will have to look for a awning to fit there.
I doubt anyone would be interested in the sensors as they are very specific in use, a TST 507 sensors will only work on a TST 507 system because of the coding. Same with the other TPMS out there. When I changed the tires on my truck last year the kid at the tire store wanted to know how to get the caps off my stems, I had forgotten to take them off. He had no idea what they were. :)