Bumper - 4" square; 1' from the ground
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https://www.etrailer.com/dept-pg-Specialty_Trailer_Hitches-sf-RV_Hitch-pt-Bumper_Mount.aspx
Ultra Fab: https://www.etrailer.com/Specialty-Trailer-Hitches/Ultra-Fab-Products/UF35-946401.html
RV Bumper 2" Trailer Hitch Receiver - Clamp-On [Swagman] $60
http://www.amazon.com/Swagman-RV-2-Bumper-Adaptor/dp/B00174ZHGU $50
http://www.swagman.net/product/bumper-adapter/
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BUMPER REINFORCEMENT
https://www.mount-n-lock.com
Safety Struts: https://www.mount-n-lock.com/mnl-cargo-products/4square-safetystruts-prevent-bumper-failure
https://www.mount-n-lock.com/mnl-cargo-products/4square-bumper-mounted-hitch-receiver-for-bike-racks
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BUMPER REPLACEMENT
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ROOF RACK
Swagman: https://www.etrailer.com/p-S80550.html
http://www.sixnall.com/