For your 2022 Forest River Rockwood I recommend going with the Furrion RV Tankless Water Heater - Gas - Automatic Pilot # FR98SR.
This is a tankless unit measuring 12-5/8" wide x 12-5/8" tall x 19-1/4" deep so you won't have to do any additional cutting to make it fit, has a heating capacity of 13,000-60,0000 BTU, and will work in elevations as high as 4,500 ft. view full answer...
It looks like your 2022 Forest River Rockwood 8337RL tops out at 11,00 lbs. Weight distribution systems are based off of a trailer's tongue weight. The tongue weight is typically between 10% and 15% of your trailer's total weight. This means your Forest River would have a tongue weight somewhere between 1,100 lbs and 1,650 lbs. With this in mind, the best system is going to be the Equal-i-zer Weight Distribution System w/ 4-Point Sway Control item # EQ64FR.
The Equal-i-zer Weight Distribution... view full answer...