Can you leave anything in the lake permanently? If so, how about an old ratty trailer that you can pick up for a couple hundred bucks. As long as the bunks are OK and are a fair match to your hull it might work. The stern of the boat will likely float anyway.
The foam pool lounge mentioned above or a kid's foam skim board would be good, simple options.
"For every complex problem there is an answer that is clear, simple, and wrong." (Henry Louis Mencken)
2005 X2, Viper Red, MCX, Acme 1285, PPass, rear 750 sacs, KGB, IBS
(previous) 2001 X5, 1991 TriStar 190