"Flight to safety" investments into U.S. Treasury bonds and gold should resume as they continue to outperform stocks. One catalyst that should help is renewed weakness in crude oil prices, as the dollar appears poised to strengthen once again.

The U.S. Treasury 30-year bond yield rose from 2.38% on Feb. 11, as stocks bottomed, to 2.759% on March 14, a week before the major equity averages peaked. This was a sign of stabilization in the flight to safety into bonds.

The flight to safety into bonds can be traded like a stock by investing in the 20+ Year Treasury Bond ETF (TLT - Get Report) , which is a basket of U.S. Treasury bonds with maturities of 20 years to 30 years.

The SPDR Barclays High Yield Bond ETF (JNK - Get Report) has been rallying with the stock market since Feb. 11 and peaked on March 18.

Comex gold traded to a 52-week high of $1,287.8 on March 11, then traded as low as $1,211.2 on March 24, well above the 50-day and 200-day simple moving averages of $1,194.6 and $1,138.5, respectively. The upside is to $1,639.9 at some point in 2016. The ETF to trade as a proxy for gold is the SPDR Gold Shares ETF (GLD - Get Report) , which is backed by gold bullion.

Nymex crude oil traded as high as $42.49 on March 1, and remains below its 200-day simple moving average of $42.45. This week's key level is $37.50, and the upside for all of 2016 remains $44.07 a barrel. One way to trade oil like a stock is using the iShares GSCI Commodity-Index Trust Fund (GSG - Get Report) , which is 70% to 75% weighed to energy and crude oil.

The euro vs. the dollar continues to trade back and forth around its 200-day simple moving average of 1.1038. A key annual level of 1.1052 remains a magnet for all off 2016, with a key level of 1.1447 this week. The best ETF that tracks the ups and downs of the dollar is the Deutsche Bank USD Index (UUP - Get Report) , which is basket of currencies including the Euro, Japanese yen, British pound, Canadian dollar, Swedish krona and Swiss franc.

Here's the daily chart for the TLT bond ETF.


Courtesy of MetaStock Xenith

The bond ETF closed at $129.54 last week, up 7.4% year to date vs. a loss of 0.4% for the S&P 500 SPDR ETF (SPY - Get Report) , as the outperformance of bonds continues.

The daily chart shows the Fibonacci Retracements of the rise from a low of $114.88 on June 25 to the Feb. 11 high of $135.35. The bond ETF is now below its 23.6% retracement of the rise at 130.47 and above the 38.2% retracement of $127.49.

Investors looking to buy the bond ETF should do so on a decline to the 200-week simple moving average of $118.48. Investors looking to reduce holdings should continue to do so on strength to $131.78 and $132.45, which are targets on technical charts until the end March and the end of 2016, respectively.

Here's the daily chart for the JNK junk bond ETF.


Courtesy of MetaStock Xenith

The junk bond ETF closed at $34.15 last week, up 0.7% year to date and up 9.2% from its 2016 low of $31.27, set on Feb. 11. The junk ETF is in correction territory, 13.9% below its April 27 high of $39.65. As you can see, the junk bond ETF tracks the stock market more than the treasury bond market.

The daily chart shows that the junk bond ETF has been below a "death cross" since Sept. 15, 2014, when the 50-day simple moving average fell below the 200-day simple moving average, indicating the lower prices were ahead. The ETF closed that day at $40.55. The death cross was still in place when the ETF traded as low as $31.27 on Feb. 11. By following this simple tool of technical analysis, investors could have avoided the pain of the junk bond crash.

Investors looking to buy the junk bond ETF should do so on a decline to $31.89, which is a key level on technical charts until the end of March. Investors looking to reduce holdings should consider doing so on strength to $35.66 and $38.62, which are key levels on technical charts until the end of March and June, respectively.

Here's the daily chart for the GLD gold ETF.


Courtesy of MetaStock Xenith

The gold ETF closed at $116.33 last week, up 14.7% year to date, after setting its 52-week high of $122.37 on March 4.

The daily chart for the gold ETF shows the Fibonacci Retracements from the July 10, 2014, high of $129.21 to the low of $100.23, set on Dec. 17. The strong flight-to-safety rally had the ETF above its 61.8% retracement of $118.13 until March 23, with the 50% retracement of $114.72.

The gold ETF is above a "golden cross," confirmed on March 1, indicating that higher prices are ahead. It also indicates for investors to buy weakness to the 50-day and 200-day simple moving averages of $114.28 and $109.03, respectively.

Investors looking to buy the gold ETF should do so on weakness to a key level on technical charts of $109.94, which is in play until the end of March. Investors looking to reduce holdings should do so on strength to $128.75, which is a key level on technical charts until the end on this week. The upside potential for all of 2016 is $157.36.

Here's the daily chart for the GSG commodity index ETF.


Courtesy of MetaStock Xenith

The commodities ETF closed at $13.99 last week, down 1.7% year to date. It is 16.3% above its Jan. 20 low of $12.03. This ETF remains in bear market territory, 37.4% below its 52-week high of $22.34 set on May 6, 2015.

The daily chart shows the Fibonacci Retracements from the May 2015 high to the Jan. 20 low. The rebound has stalled just above the 23.6% retracement of $14.46. The 200-day simple moving average is an upside target at $16.20.

Investors looking to buy the commodities ETF should do so on weakness to $13.19, which is a key level on technical charts until the end of March. Investors looking to reduce holdings should do so on strength to $18.42, which is a key level on technical charts in play until the end of June.

Here's the daily chart for the UUP dollar index ETF.


Courtesy of MetaStock Xenith

The dollar ETF closed at $24.93 last week, down 2.8% year to date. It set a 2016 low of $24.54 on March 17.

The daily chart shows random trading since the ETF traded as high as $26.50 on March 13, 2015, then traded as low as $24.20 on Aug. 24, 2015. The horizontal lines are the Fibonacci Retracements of this decline. After failing above the 61.8% retracement of $25.63, this ETF is above its 23.6% retracement of $24.75.

Investors looking to buy the dollar ETF should do so on weakness to $24.18 and $23.31, which are key levels on technical charts until the end of June and the end of 2016, respectively. Investors looking to reduce holdings should do so on strength to $25.95 and $26.68, which are key levels on technical charts until the end of March.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.