If you have over 10,000 miles or it has been 2 years since the last grease & pack, you should check it & proceed as needed.

When you do a grease & pack you should take off the drums and clean and inspect bearings, races and drum. Then clean and test the brakes and proceed with what is needed. Always replace the caps and seals. 

Time to check your tire's,  Anything Over 4-5 years should be replaced.

Flush freshwater system before first use

Wash your rubber roof and inspect it for any maintenance.

BOAT TRAILERS: It is recommended that all boat trailers do a grease and pack (a total axle service) before starting the season if you didn't do one before you put your trailer away for winter. Brake fluid should be flushed out on a yearly basis.