We got bees nesting in undercarriage.

If they look like a bumble bee perhaps they are carpenter bees. (which is not a good thing...) They like to bore holes in unpainted wood. I'd spray foaming wasp spray into the slit, then seal it up. If they die in there it's no big deal.

I use a Shop Vac with a long hose extender to rid unwanted nesting.

Guess I am in big trouble haha... We usually camp at LAKEWOOD SC every year for small family get-together.

They have those real small sand ants there and boy do I get loaded down with them... Tried everything to keep them out of my small trailer...

When we leave there we head for Gatlinburg TN on our way back back home to spend a few nights in our most favorite place being ELKMONT Camp inside the Smoky Natl Park...

Needless to say we have deal with all the ants when we setup... They are everywhere and in everything... Even my truck gets them inside the truck haha...

I'm sure I have transported this species from SC to TN for many years... I'm probably the reason for all the trees dying off on the high country places...

Roy Ken

Wasp spray. Put the nozzle inside the hole. Dress apropriately and try to do it when it's the coolest part of the day. It happens

I had a similar issue this year. I put my slides out and the air was suddenly filled with wasps. I gave them about an hour to settle down and then located the nest on the frame and sprayed it with wasp spray. I noticed them on the other side of my coach, too. I haven't been able to locate the second nest, though.

downtheroad wrote:
Sounds like you have a wasp/yellow jacket nest.
Home Depot - wasp and yellow jacket spray into the entry hole...soak it. Best to do in the last evening or night when most of the colony is home. Even better if you can peel back the coroplast and blast the nest directly with the spray.

The seal the hole.

Don't seal the hole until the nest has been eliminated my neighbor did that and the bees found a new entrance/exit through the trailer, not fun having bees filling up your living quarters.

Sounds like you have a wasp/yellow jacket nest.
Home Depot - wasp and yellow jacket spray into the entry hole...soak it. Best to do in the last evening or night when most of the colony is home. Even better if you can peel back the coroplast and blast the nest directly with the spray.

The seal the hole.

Find a local beekeeper and he will get rid of them for you.
How to find beekeepers

Bug spray... Probably not a good idea to transport flying insects from state to state.