How difficult is it backing a 8ft trailer behind Mercedes B+

Option to put a hitch ball on front of MH. Than push trailer into place.

Don't know about behind the B+, but I can tell your the shorter the trailer the harder it is to back due to how fast it reacts. That is especially true when you cannot see it well. My 8' utility trailer is much harder to back than my 16' utility trailer.

What are you trying to take with you that won't fit? Are you planning on full-timing, doing for 2+ months at a time, or doing short trips of less than 1 month?

If you're going to be doing short trips and want to bring ATVs, bicycles, etc. on occasion, I'd say go for it. You can choose to bring along or leave at home the trailer and stuff depending on your destination. This will allow you to use the B+ to the best of its advantages (ease of parking, fitting in spaces, etc.) when needed or desired.

If you're going to be doing 2+ months at a time (or full-timing) and need the extra room to store camp chairs, outdoor tables, grills, etc., then I'd say rethink your RV choice. A bigger RV towing a small car will be better than a small RV towing a cargo trailer. The joy of a small RV is being able to use it as you would a regular vehicle (easy parking, fitting in spaces, etc.). Once you add a cargo trailer as a permanent addition to the RV, you lose the benefit of having a small RV.

I think you will find it's not all that hard because of the long overhang from the rear axle. Click on "How I tow" below as it's a lot easier than I thought it would be and if I have enough room up front I can stop it from jackknifing. When I need to turn around I'll pull past a side street without any traffic coming on it and then back into it usually on the first try. Granted I'm a farm boy and I've been backing trailers for decades. You may want to add reflectors that make the back of the trailer as wide as the B+ so you can see where the trailer is headed sooner if it's a narrow trailer.

While you do not need this answer to your question... buy something bigger than a B+ that most importantly... will have bigger tanks and more room for your stuff. My overall MPG is 14 (7 + 21= 28/2 = 14) as we put as many miles on the toad as the MH which becomes out base camp. If I was willing to drive a toad that got 30+ MPG my overall MPG would be better than a MB B+ pulling a trailer.

How much MPG is the trailer going to decrease the MB's MPG? I know in my situation the toad is not noticeable but it's less than 1/10 of my total weight. Good luck in your choice if it's for extended periods of time.