I looked around here and haven't found anything on this one yet. I have a 2012 36RL, with the euro spring bed. I'm not sure if the original mattress has been replaced, but looking at the overhang at the foot, it looks like a short queen may have been originally installed at the factory and replaced with a standard queen. What I want to know is, has anyone removed the euro springs under their mattress? Those things bounce around like a water bed, and we neither one like that. I'm assuming that a plywood base sized to fit the mattress needs to be installed for proper support?

Removed that POS euro spring the 1st year we had the RW & replaced with 1/2" plywood. Not sure about the RL but my FB came with a standard queen mattress that hungover the euro thing a couple inches & we've also replaced the original POS mattress with a standard queen, much better setup.

Same here, removed the Euro Springs that were in our 2014 FL and put a 1/2 plywood base in place of it.
Bought a standard queen mattress from the furniture store.
Much better now !!!

Removed that POS euro spring the 1st year we had the RW & replaced with 1/2" plywood. Not sure about the RL but my FB came with a standard queen mattress that hungover the euro thing a couple inches & we've also replaced the original POS mattress with a standard queen, much better setup.

I did the same to the bed in our 2012 36RL three years ago. Still have the original mattress which is a full size queen (60 x 80 inches). When I installed the 1/2 inch plywood, I extended it 4 1/2 inches beyond the frame at the foot of the mattress. This now supports the foot of the mattress much better and you can sit on the foot of the mattress.

I extended my plywood base some to get the mattress firm when sitting on the end but on a our FL model you have to be careful how far you extend the base as the bed and wardrobe slides are opposing so the bed pushes the bottom part of the draws in under the TV and Hanging Closets.
I wanted the Mattress hitting the drawers not the plywood as the plywood will rub the handles and drawer faces in a FL model.

I think we will go the plywood route. We just pulled everything up to take a look at how everything was built, as well as looking underneath. We have a washer/dryer combo coming Monday, so we wanted to check the drain plumbing. It already has the flex hose. Another great tip I learned on the forum. We sure don't want the washer draining under the bed. We also found a sizeable storage area at the foot of the bed, so I'm going to cut a hole at foot of the bed, frame it in and put a cabinet doors there. It's not the handiest place to get to, but nice for infrequently used stuff.

I think we will go the plywood route. We just pulled everything up to take a look at how everything was built, as well as looking underneath. We have a washer/dryer combo coming Monday, so we wanted to check the drain plumbing. It already has the flex hose. Another great tip I learned on the forum. We sure don't want the washer draining under the bed. We also found a sizeable storage area at the foot of the bed, so I'm going to cut a hole at foot of the bed, frame it in and put a cabinet doors there. It's not the handiest place to get to, but nice for infrequently used stuff.

I did the storage at the foot also, it made a compartment about 15" x 15" x 36". As you said it's not the handiest spot to get to but works well for some seasonal stuff.

Goat, just make darn sure that the Flex hose is FIRMLY attached to the Black PVC line as that where it pulls apart.

It has threaded fittings joining the two.

Good deal, means RW finally wised up. Ours was just a slip fitting with a jam not, but wouldn't tighten against the end of the flex hose.

If that is the flex line from the washer, ours was never connected but the couplings were in there. Fortunately, we don't have a washer.