I did have to trim the lower rub rail ends on both sides of the old opening to get the door to fit cleanly, but that was minor compared to the work it took to get the unit installed and plumbing connected in my closet bottom area where our heater li bed...
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'The Silver HamShack' (2007 International 22FB CCD 75th Aniversary model)
Multiple Yaesu Radios inside and many antennae sprouting from roof, ProPride hitch
2012 shortbed crewcab 4x4 Toyota Taco TV with more antennae on it