Recently purchased an Adco Tyvek cover and using the measuring method recommended ordered the 31'7" to 34' cover. Way to big. Has anyone covered their 27RKSS and found a good fitting cover. We're in Wis. and have plenty of snow so cover must be suitable. I think the rounded front may have contributed to baggy fit. Was 31'6'' before adding spare tire which is just a bolt on bracket easily removed for winter storing. 32' adding spare. Thanks.