First of all, make sure your 4Runner, as equipped, is rated to tow that amount of weight. The dry weight stated on the trailer label should be considered the correct weight. More importantly, make sure you don't exceed the GVWR of the trailer. After putting your personal gear in the trailer, take it to a CAT scale and get your total weight and hitch weight.
Make sure you are getting a good WD hitch with antisway. The Equalizer is a good choice as well as the Reese dual cam or the Blue Ox SwayPro. If looking at Hensley/ProPride, compare the weights of the hitches as you may not want a heavier hitch (I had a Hensley and it is a great hitch). Make sure all the suspension components of your 4Runner are it top condition i.e. replace any shocks and/or struts if needed. Make sure you have good LT tires on the 4Runner. You don't want to be towing with a tires rated for cars (I made that mistake with my Tundra and once I put LT tires on, the difference was noticeable). I don't think it will be the greatest towing combination due to the length of the trailer, but since you are only towing it to get from one job location to the next, you may be able to get by.
When you do have to tow, avoid high winds and keep your speed at 60mph or lower.
And, after all is said and done, you may find that the towing performance is below par and you could be in the position of deciding on whether to get a better tow vehicle or smaller/lighter trailer.
