I think you should avoid using the 4" bumper as other posters have said. The stresses are much too high for most of these bumpers. Carry a sewer hose in it and stop there.
Our trailer did not have the 4" bumper or a spare tire in back. We did have a pretty hefty I-beam frame, so I worked with a local welder to fabricate a 2" receiver hitch for the back of trailer. Now, I can use the bike racks made for 2" receivers and then move same to our tow vehicle once we get to camp. By using a "hitch vise" on the 2" receiver, I keep the bike rack from wagging around back there.
On our Spring Break trip to Orlando, we used a "hang-down" style bike rack. I just purchased a "Raxter" rack. It is much better as it supports the bikes entirely from the tires only and can adapt to all sizes of bikes.
2008 Arctic Fox 32D 8650 UVW, 11700 GVW
2005 Ford Excursion Limited w/6.0L PSD, >143,000 miles
Hellwig anti-sway, V/B Springs, ARP studs, SCT programmer, Banks Techni-cooler, 4" MBRP exhaust,
Hensley Arrow hitch, Tekonsha Prodigy
I only carry one bike and I carry it on the front of the trailer between the propane tanks and the battery. I bolted a Yakima bike wheel trough across the A frame. while I do have to take the left pedal off so it won't hit the tanks, it fits really well. Then I bolted the hinged section of a long hasp to the tank hold down and attached it to a custom bracket on the bike with a wingnut. It worked without any mods on our Rainier, but I had to move the propane tanks ahead about 3 inches to make it work on the old Wilderness. this keeps the bike where I can see it and doesn't put stress on the back bumper. (I also take the seat off, its a Trek so its made to take apart easily)
I seen someone else had the front hitch on their vehicle when we were coming back Memorial Day. The idea crossed my mind, by being I am hoping to get a newer truck in the next year or 2, I didn't put much thought into that option.
Even with a hitch welded to the frame you still need to support the bikes so they don`t bounce up and down and tear the metal on the frame/hitch or rack. I use a bolt on reciever that wraps around the bumper. her is what I did!
I put 2 stainless eye bolts through the bunk and wall studs to support the weight of the bikes. I use 2 ratcheting straps criss/crossed to keep the bikes from bouncing up and down and side-side. it`s not in the last picture but I put a setbolt through the top of the reciever to take the play out of the bike rack. I also run a ratchet strap under the bumper and over the bike rack toungue to minimize any play in the hitch. I have 4 bikes with this setup and have no failures and no issues. I have a rear view camera that I can watch the bikes with while I also watch the road behind me. they do not move at all! I have well over 3k miles with this setup and would not hesitate to keep doing it! it can be done if done properly!
Son Brandon 11yrs
Daughter Marissa 10yrs
07 Cherokee 32B
02 Excursion 4X4 V-10 4.30 gear 5Star tuner Y-pipe mod Hellwig sway bar
Reese HP dualcam Prodigy brake controller
A bad day of camping is
better than a good day at work!
I picked up my 2013 Jayco White Hawk 28DSBH last week. I did not want to risk mounting a reciever on the bumper so I had them add a custom made 2" receiver to the back of the trailer. The weld shop used 2"X4" square stock and welded it to the frame. The cost was only $350. This will easily hold my bike rack and 4 26" bikes.
There might be options, but there are not many good options for hauling bikes on the back of the trailer…
The first thing you need to know is,
how much weight your bumper is rated for…
you need to know how much weight the frame rails will support off the back of the trailer…
How close to maximum load your trailer is…
How close to maximum load are your tires…
How much reduced tongue weight can you afford…
After you know that you need to decide how much you are willing to spend… cheap bike rakes won’t hold up very well…
You can’t make a informed decision and no one can recommend no matter how well intended what you can do because we don’t have enough information to make a recommendation… if your trailer is new or still under warranty you will want to ask what welding anything to the frame does to the warranty…
A lot of people haul bikes on the back of their trailers, and a lot of those shouldn’t be doing it…
Love my mass produced, entry level, built by Lazy American Workers, Hornet