John's answer x2. It isn't the tires...you are too light on the hitch and tongue. The trailer was probably OK until you loaded it up. Increase the tongue weight and you should be OK.
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Earl
2007 33.5' Arctic Fox Fifth Wheel used for full-timing for several years--now sold
2011 Hideout 23RKSWE that we now use for poking around local parks
2007 Chevy 3/4 ton diesel with Prodigy Brake Control
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