Here is a starting point to give you an idea of what is available. A skid bar may be the simplest way, if you gusset the open area to withstand the forces.
http://www.industrialcasterandwheel.com/
http://www.harborfreight.com/catalog...sult?q=castors
Don't skimp on the strength--you will often place a lot of stress on the castor.
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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